diff --git a/ui/ui.sortable.js b/ui/ui.sortable.js
index d2b337837..1ecf0bc4a 100644
--- a/ui/ui.sortable.js
+++ b/ui/ui.sortable.js
@@ -87,59 +87,58 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 		this.refreshPositions();
 
 		//Create and append the visible helper
-		this.helper = this.createHelper(event);
+		this.helper = this._createHelper(event);
+		
+		//Cache the helper size
+		this._cacheHelperProportions();
 
 		/*
 		 * - Position generation -
 		 * This block generates everything position related - it's the core of draggables.
 		 */
 
-		this.margins = {																				//Cache the margins
-			left: (parseInt(this.currentItem.css("marginLeft"),10) || 0),
-			top: (parseInt(this.currentItem.css("marginTop"),10) || 0)
-		};
-
-		this.offset = this.currentItem.offset();														//The element's absolute position on the page
-		this.offset = {																					//Substract the margins from the element's absolute offset
+		//Cache the margins of the original element
+		this._cacheMargins();
+		
+		//Store the helper's css position
+		this.cssPosition = this.helper.css("position");
+		this.scrollParent = this.helper.scrollParent();
+		
+		//The element's absolute position on the page minus margins
+		this.offset = this.currentItem.offset();														
+		this.offset = {
 			top: this.offset.top - this.margins.top,
 			left: this.offset.left - this.margins.left
 		};
+		
+		$.extend(this.offset, {
+			click: { //Where the click happened, relative to the element
+				left: event.pageX - this.offset.left,
+				top: event.pageY - this.offset.top
+			},
+			parent: this._getParentOffset(),
+			relative: this._getRelativeOffset() //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helper
+		});
 
-		this.offset.click = {																			//Where the click happened, relative to the element
-			left: event.pageX - this.offset.left,
-			top: event.pageY - this.offset.top
-		};
+		//Adjust the mouse offset relative to the helper if 'cursorAt' is supplied
+		if(o.cursorAt)
+			this._adjustOffsetFromHelper(o.cursorAt);	
 
-		this.offsetParent = this.helper.offsetParent();													//Get the offsetParent and cache its position
-		var po = this.offsetParent.offset();
+		//Generate the original position
+		this.originalPosition = this._generatePosition(event);
 
-		this.offsetParentBorders = {
-			top: (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
-			left: (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
-		};
+		//Cache the former DOM position
+		this.domPosition = { prev: this.currentItem.prev()[0], parent: this.currentItem.parent()[0] };
+		
+		//Set a containment if given in the options
+		if(o.containment)
+			this._setContainment();
 
-		this.offset.parent = {																			//Store its position plus border
-			top: po.top + this.offsetParentBorders.top,
-			left: po.left + this.offsetParentBorders.left
-		};
-
-		this.originalPosition = this._generatePosition(event);				//Generate the original position
-		this.domPosition = { prev: this.currentItem.prev()[0], parent: this.currentItem.parent()[0] };  //Cache the former DOM position
-
-		//If o.placeholder is used, create a new element at the given position with the class
-		this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };//Cache the helper size
-
-		if(o.helper == "original") {
-			this._storedCSS = { position: this.currentItem.css("position"), top: this.currentItem.css("top"), left: this.currentItem.css("left"), clear: this.currentItem.css("clear") };
-		} else {
-			this.currentItem.hide(); //Hide the original, won't cause anything bad this way
+		//If the helper is not the original, hide the original so it's not playing any role during the drag, won't cause anything bad this way
+		if(this.helper[0] != this.currentItem[0]) {
+			this.currentItem.hide();
 		}
 
-		//Position it absolutely and add a helper class
-		this.helper
-			.css({ position: 'absolute', clear: 'both' })
-			.addClass('ui-sortable-helper');
-
 		//Create the placeholder
 		this._createPlaceholder();
 
@@ -148,42 +147,8 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 
 		//Recache the helper size
 		if(!this._preserveHelperProportions)
-			this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };
+			this._cacheHelperProportions();
 
-		if(o.cursorAt) {
-			if(o.cursorAt.left != undefined) this.offset.click.left = o.cursorAt.left;
-			if(o.cursorAt.right != undefined) this.offset.click.left = this.helperProportions.width - o.cursorAt.right;
-			if(o.cursorAt.top != undefined) this.offset.click.top = o.cursorAt.top;
-			if(o.cursorAt.bottom != undefined) this.offset.click.top = this.helperProportions.height - o.cursorAt.bottom;
-		}
-
-		/*
-		 * - Position constraining -
-		 * Here we prepare position constraining like grid and containment.
-		 */
-
-		if(o.containment) {
-			if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
-			if(o.containment == 'document' || o.containment == 'window') this.containment = [
-				0 - this.offset.parent.left,
-				0 - this.offset.parent.top,
-				$(o.containment == 'document' ? document : window).width() - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
-				($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.element.css("marginBottom"),10) || 0)
-			];
-
-			if(!(/^(document|window|parent)$/).test(o.containment)) {
-				var ce = $(o.containment)[0];
-				var co = $(o.containment).offset();
-				var over = ($(ce).css("overflow") != 'hidden');
-
-				this.containment = [
-					co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.parent.left,
-					co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.parent.top,
-					co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.currentItem.css("marginRight"),10) || 0),
-					co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.currentItem.css("marginBottom"),10) || 0)
-				];
-			}
-		}
 
 		//Post 'activate' events to possible containers
 		if(!noActivation) {
@@ -199,12 +164,14 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 
 		this.dragging = true;
 
+		this.helper.addClass('ui-sortable-helper');
 		this._mouseDrag(event); //Execute the drag once - this causes the helper not to be visible before getting its correct position
 		return true;
 
 	},
 
 	_mouseDrag: function(event) {
+		
 		//Compute the helpers position
 		this.position = this._generatePosition(event);
 		this.positionAbs = this._convertPositionTo("absolute");
@@ -219,32 +186,26 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 		//Regenerate the absolute position used for position checks
 		this.positionAbs = this._convertPositionTo("absolute");
 
-		//Set the helper's position
-		if (this.helper) {
-			this.helper[0].style.left = this.position.left+'px';
-			this.helper[0].style.top = this.position.top+'px';
-		}
+		//Set the helper position
+		if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
+		if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';
+		
 		//Rearrange
 		for (var i = this.items.length - 1; i >= 0; i--) {
 
-			var item = this.items[i], intersection = this._intersectsWithPointer(item);
-
+			//Cache variables and intersection, continue if no intersection
+			var item = this.items[i], itemElement = item.item[0], intersection = this._intersectsWithPointer(item);
 			if (!intersection) continue;
 
-			var itemChecked = this.items[i].item[0];
-
-			if(itemChecked != this.currentItem[0] //cannot intersect with itself
-				&&	this.placeholder[intersection == 1 ? "next" : "prev"]()[0] != itemChecked //no useless actions that have been done before
-				&&	!$.ui.contains(this.placeholder[0], itemChecked) //no action if the item moved is the parent of the item checked
-				&& (this.options.type == 'semi-dynamic' ? !$.ui.contains(this.element[0], itemChecked) : true)
+			if(itemElement != this.currentItem[0] //cannot intersect with itself
+				&&	this.placeholder[intersection == 1 ? "next" : "prev"]()[0] != itemElement //no useless actions that have been done before
+				&&	!$.ui.contains(this.placeholder[0], itemElement) //no action if the item moved is the parent of the item checked
+				&& (this.options.type == 'semi-dynamic' ? !$.ui.contains(this.element[0], itemElement) : true)
 			) {
 
 				this.direction = intersection == 1 ? "down" : "up";
 
-				if (this.options.tolerance == "pointer") {
-					this.options.sortIndicator.call(this, event, item);
-				}
-				else if (this.options.tolerance == "guess" && this._intersectsGuess(item)) {
+				if (this.options.tolerance == "pointer" || (this.options.tolerance == "guess" && this._intersectsGuess(item))) {
 					this.options.sortIndicator.call(this, event, item);
 				}
 
@@ -260,10 +221,9 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 		if($.ui.ddmanager) $.ui.ddmanager.drag(this, event);
 
 		//Call callbacks
-		this.element.triggerHandler("sort", [event, this._ui()], this.options["sort"]);
+		this._trigger('sort', event, this._ui());
 
 		this.lastPositionAbs = this.positionAbs;
-
 		return false;
 
 	},
@@ -365,15 +325,26 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 
 	/* Be careful with the following core functions */
 	_intersectsWith: function(item) {
-		var x1 = this.positionAbs.left, x2 = x1 + this.helperProportions.width,
-		y1 = this.positionAbs.top, y2 = y1 + this.helperProportions.height;
-		var l = item.left, r = l + item.width,
-		t = item.top, b = t + item.height;
+		
+		var x1 = this.positionAbs.left,
+			x2 = x1 + this.helperProportions.width,
+			y1 = this.positionAbs.top,
+			y2 = y1 + this.helperProportions.height;
+			
+		var l = item.left,
+			r = l + item.width,
+			t = item.top,
+			b = t + item.height;
 
-		var dyClick = this.offset.click.top, dxClick = this.offset.click.left;
+		var dyClick = this.offset.click.top,
+			dxClick = this.offset.click.left;
+		
 		var isOverElement = (y1 + dyClick) > t && (y1 + dyClick) < b && (x1 + dxClick) > l && (x1 + dxClick) < r;
 
-		if(this.options.tolerance == "pointer" || this.options.forcePointerForContainers || (this.options.tolerance == "guess" && this.helperProportions[this.floating ? 'width' : 'height'] > item[this.floating ? 'width' : 'height'])) {
+		if(	   this.options.tolerance == "pointer"
+			|| this.options.forcePointerForContainers
+			|| (this.options.tolerance == "guess" && this.helperProportions[this.floating ? 'width' : 'height'] > item[this.floating ? 'width' : 'height'])
+		) {
 			return isOverElement;
 		} else {
 
@@ -386,110 +357,45 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 	},
 
 	_intersectsWithPointer: function(item) {
-		var dyClick = this.offset.click.top, dxClick = this.offset.click.left;
-		var helperTop = this.positionAbs.top, helperLeft = this.positionAbs.left;
-		var itemHeight = item.height, itemWidth = item.width;
-		var itemTop = item.top, itemLeft = item.left;
 
-		if (this.cancelIntersection) {
+		var isOverElementHeight = $.ui.isOverAxis(this.positionAbs.top + this.offset.click.top, item.top, item.height),
+			isOverElementWidth = $.ui.isOverAxis(this.positionAbs.left + this.offset.click.left, item.left, item.width),
+			isOverElement = isOverElementHeight && isOverElementWidth,
+			verticalDirection = this._getDragVerticalDirection(),
+			horizontalDirection = this._getDragHorizontalDirection();
+
+		if (!isOverElement)
 			return false;
-		}
 
-		var isOverElementHeight = $.ui.isOverAxis(helperTop + dyClick, itemTop, itemHeight);
-		var isOverElementWidth = $.ui.isOverAxis(helperLeft + dxClick, itemLeft, itemWidth);
-		var isOverElement = isOverElementHeight && isOverElementWidth;
-		var verticalDirection = this._getDragVerticalDirection();
-		var horizontalDirection = this._getDragHorizontalDirection();
+		return this.floating ?
+			( ((horizontalDirection && horizontalDirection == "right") || verticalDirection == "down") ? 2 : 1 )
+			: ( verticalDirection && (verticalDirection == "down" ? 2 : 1) );
 
-		if (!isOverElement) return false;
-
-		if (this.floating) {
-
-			if (!horizontalDirection) {
-				return verticalDirection == "down" ? 2 : 1;
-			}
-
-			return horizontalDirection == "right" ? 2 : 1;
-		}
-		else {
-
-			if (!verticalDirection) {
-				return false;
-			}
-
-			return verticalDirection == "down" ? 2 : 1;
-		}
-
-		return false;
 	},
 
 	_intersectsGuess: function(item) {
-		var dyClick = this.offset.click.top, dxClick = this.offset.click.left;
-		var helperTop = this.positionAbs.top, helperLeft = this.positionAbs.left;
-		var itemHeight = item.height, itemWidth = item.width;
-		var itemTop = item.top, itemLeft = item.left;
+		
+		var isOverBottomHalf = $.ui.isOverAxis(this.positionAbs.top + this.offset.click.top, item.top + (item.height/2), item.height),
+			isOverRightHalf = $.ui.isOverAxis(this.positionAbs.left + this.offset.click.left, item.left + (item.width/2), item.width),
+			verticalDirection = this._getDragVerticalDirection(),
+			horizontalDirection = this._getDragHorizontalDirection();
 
-		var isOverBottomHalf = $.ui.isOverAxis(helperTop + dyClick, itemTop + (itemHeight/2), itemHeight);
-		var isOverTopHalf = !isOverBottomHalf;
-		var isOverRightHalf = $.ui.isOverAxis(helperLeft + dxClick, itemLeft + (itemWidth/2), itemWidth);
-		var isOverLeftHalf = !isOverRightHalf;
-		var verticalDirection = this._getDragVerticalDirection();
-		var horizontalDirection = this._getDragHorizontalDirection();
-
-		var verticalIntersection = function() {
-			if (!verticalDirection) {
-				return false;
-			}
-			if (verticalDirection == "down" && isOverBottomHalf ||
-				verticalDirection == "up" && isOverTopHalf) {
-				return true;
-			}
-		};
-
-		var horizontalIntersection = function() {
-			if (!horizontalDirection) {
-				return verticalIntersection();
-			}
-			if (horizontalDirection == "left" && isOverLeftHalf ||
-				horizontalDirection == "right" && isOverRightHalf) {
-				return true;
-			}
-		};
-
-		if (this.floating) {
-			return horizontalIntersection();
-		}
-		else {
-			return verticalIntersection();
+		if (this.floating && horizontalDirection) {
+			return ((horizontalDirection == "right" && isOverRightHalf) || (horizontalDirection == "left" && !isOverRightHalf));
+		} else {
+			return verticalDirection && ((verticalDirection == "down" && isOverBottomHalf) || (verticalDirection == "up" && !isOverBottomHalf));
 		}
 
-		return false;
 	},
 
 	_getDragVerticalDirection: function() {
-		var helperTop = this.positionAbs.top;
-		var lastTop = this.lastPositionAbs.top;
-		var delta = helperTop - lastTop;
-
-		if (delta == 0) {
-			return false;
-		}
-
-		var direction = delta > 0 ? "down" : "up";
-		return direction;
+		var delta = this.positionAbs.top - this.lastPositionAbs.top;
+		return delta != 0 && (delta > 0 ? "down" : "up");
 	},
 
 	_getDragHorizontalDirection: function() {
-		var helperLeft = this.positionAbs.left;
-		var lastLeft = this.lastPositionAbs.left;
-		var delta = helperLeft - lastLeft;
-
-		if (delta == 0) {
-			return false;
-		}
-
-		var direction = delta > 0 ? "right" : "left";
-		return direction;
+		var delta = this.positionAbs.left - this.lastPositionAbs.left;
+		return delta != 0 && (delta > 0 ? "right" : "left");
 	},
 
 	refresh: function(event) {
@@ -586,9 +492,8 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 	refreshPositions: function(fast) {
 
 		//This has to be redone because due to the item being moved out/into the offsetParent, the offsetParent's position will change
-		if(this.offsetParent) {
-			var po = this.offsetParent.offset();
-			this.offset.parent = { top: po.top + this.offsetParentBorders.top, left: po.left + this.offsetParentBorders.left };
+		if(this.offsetParent && this.helper) {
+			this.offset.parent = this._getParentOffset();
 		}
 
 		for (var i = this.items.length - 1; i >= 0; i--){
@@ -601,7 +506,7 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 			var t = this.options.toleranceElement ? $(this.options.toleranceElement, item.item) : item.item;
 
 			if (!fast) {
-				if (this.options.accurate) {
+				if (this.options.accurateIntersection) {
 					item.width = t.width();
 					item.height = t.height();
 				}
@@ -717,52 +622,145 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 		};
 	},
 
-	createHelper: function(event) {
+	_createHelper: function(event) {
 
 		var o = this.options;
-		var helper = typeof o.helper == 'function' ? $(o.helper.apply(this.element[0], [event, this.currentItem])) : (o.helper == "original" ? this.currentItem :  this.currentItem.clone());
+		var helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [event, this.currentItem])) : (o.helper == 'clone' ? this.currentItem.clone() : this.currentItem);
+		
+		if(!helper.parents('body').length) //Add the helper to the DOM if that didn't happen already
+			$(o.appendTo != 'parent' ? o.appendTo : this.currentItem[0].parentNode)[0].appendChild(helper[0]);
 
-		if (!helper.parents('body').length)
-			$(o.appendTo != 'parent' ? o.appendTo : this.currentItem[0].parentNode)[0].appendChild(helper[0]); //Add the helper to the DOM if that didn't happen already
+		if(helper[0] == this.currentItem[0])
+			this._storedCSS = { width: this.currentItem[0].style.width, height: this.currentItem[0].style.height, position: this.currentItem.css("position"), top: this.currentItem.css("top"), left: this.currentItem.css("left") };
 
+		if(helper[0].style.width == '' || o.forceHelperSize) helper.width(this.currentItem.width());
+		if(helper[0].style.height == '' || o.forceHelperSize) helper.height(this.currentItem.height());
+
+		//TODO: Still need to figure out a way to make relative sorting possible
+		helper.css("position", "absolute");
+		
 		return helper;
 
 	},
+	
+	_adjustOffsetFromHelper: function(obj) {
+		if(obj.left != undefined) this.offset.click.left = obj.left + this.margins.left;
+		if(obj.right != undefined) this.offset.click.left = this.helperProportions.width - obj.right + this.margins.left;
+		if(obj.top != undefined) this.offset.click.top = obj.top + this.margins.top;
+		if(obj.bottom != undefined) this.offset.click.top = this.helperProportions.height - obj.bottom + this.margins.top;
+	},
+	
+	_getParentOffset: function() {
+
+		//Get the offsetParent and cache its position
+		this.offsetParent = this.helper.offsetParent(); var po = this.offsetParent.offset();
+
+		if((this.offsetParent[0] == document.body && $.browser.mozilla)	//Ugly FF3 fix
+		|| (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() == 'html' && $.browser.msie)) //Ugly IE fix
+			po = { top: 0, left: 0 };													
+
+		return {
+			top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
+			left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
+		};
+
+	},
+	
+	_getRelativeOffset: function() {
+
+		if(this.cssPosition == "relative") {
+			var p = this.currentItem.position();
+			return {
+				top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.scrollParent.scrollTop(),
+				left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.scrollParent.scrollLeft()
+			};
+		} else {
+			return { top: 0, left: 0 };
+		}
+		
+	},
+	
+	_cacheMargins: function() {
+		this.margins = {
+			left: (parseInt(this.currentItem.css("marginLeft"),10) || 0),
+			top: (parseInt(this.currentItem.css("marginTop"),10) || 0)
+		};
+	},
+
+	_cacheHelperProportions: function() {
+		this.helperProportions = {
+			width: this.helper.outerWidth(),
+			height: this.helper.outerHeight()
+		};
+	},
+
+	_setContainment: function() {
+
+		var o = this.options;
+		if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
+		if(o.containment == 'document' || o.containment == 'window') this.containment = [
+			0 - this.offset.relative.left - this.offset.parent.left,
+			0 - this.offset.relative.top - this.offset.parent.top,
+			$(o.containment == 'document' ? document : window).width() - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.currentItem.css("marginRight"),10) || 0),
+			($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.currentItem.css("marginBottom"),10) || 0)
+		];
+
+		if(!(/^(document|window|parent)$/).test(o.containment)) {
+			var ce = $(o.containment)[0];
+			var co = $(o.containment).offset();
+			var over = ($(ce).css("overflow") != 'hidden');
+
+			this.containment = [
+				co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left,
+				co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top,
+				co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.currentItem.css("marginRight"),10) || 0),
+				co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.currentItem.css("marginBottom"),10) || 0)
+			];
+		}
+
+	},
 
 	_convertPositionTo: function(d, pos) {
+
 		if(!pos) pos = this.position;
 		var mod = d == "absolute" ? 1 : -1;
+
 		return {
 			top: (
 				pos.top																	// the calculated relative position
+				+ this.offset.relative.top	* mod										// Only for relative positioned nodes: Relative offset from element to offset parent
 				+ this.offset.parent.top * mod											// The offsetParent's offset without borders (offset + border)
-				- (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop) * mod	// The offsetParent's scroll position
+				+ ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollTop() : this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'].scrollTop() ) * mod
 				+ this.margins.top * mod												//Add the margin (you don't want the margin counting in intersection methods)
 			),
 			left: (
 				pos.left																// the calculated relative position
+				+ this.offset.relative.left	* mod										// Only for relative positioned nodes: Relative offset from element to offset parent
 				+ this.offset.parent.left * mod											// The offsetParent's offset without borders (offset + border)
-				- (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft) * mod	// The offsetParent's scroll position
+				+ ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'].scrollLeft() ) * mod
 				+ this.margins.left * mod												//Add the margin (you don't want the margin counting in intersection methods)
 			)
 		};
 	},
-
+	
 	_generatePosition: function(event) {
 
-		var o = this.options;
+		var o = this.options, scroll = this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'], scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);	
+
 		var position = {
 			top: (
-				event.pageY																	// The absolute mouse position
+				event.pageY																// The absolute mouse position
 				- this.offset.click.top													// Click offset (relative to the element)
+				- this.offset.relative.top												// Only for relative positioned nodes: Relative offset from element to offset parent
 				- this.offset.parent.top												// The offsetParent's offset without borders (offset + border)
-				+ (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollTop)	// The offsetParent's scroll position, not if the element is fixed
+				+ ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) )
 			),
 			left: (
-				event.pageX																	// The absolute mouse position
+				event.pageX																// The absolute mouse position
 				- this.offset.click.left												// Click offset (relative to the element)
+				- this.offset.relative.left												// Only for relative positioned nodes: Relative offset from element to offset parent
 				- this.offset.parent.left												// The offsetParent's offset without borders (offset + border)
-				+ (this.offsetParent[0] == document.body ? 0 : this.offsetParent[0].scrollLeft)	// The offsetParent's scroll position, not if the element is fixed
+				+ ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() )
 			)
 		};
 
@@ -816,10 +814,14 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 		if(!this._noFinalSort) this.placeholder.before(this.currentItem);
 		this._noFinalSort = null;
 
-		if(this.options.helper == "original")
+		if(this.helper[0] == this.currentItem[0]) {
+			for(var i in this._storedCSS) {
+				if(this._storedCSS[i] == 'auto' || this._storedCSS[i] == 'static') this._storedCSS[i] = '';
+			}
 			this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper");
-		else
+		} else {
 			this.currentItem.show();
+		}
 
 		if(this.domPosition.prev != this.currentItem.prev().not(".ui-sortable-helper")[0] || this.domPosition.parent != this.currentItem.parent()[0]) this._propagate("update", event, null, noPropagation); //Trigger update callback if the DOM position has changed
 		if(!$.ui.contains(this.element[0], this.currentItem[0])) { //Node was moved out of the current element
@@ -886,13 +888,14 @@ $.extend($.ui.sortable, {
 	getter: "serialize toArray",
 	version: "@VERSION",
 	defaults: {
-		accurate: false,
+		accurateIntersection: true,
 		appendTo: "parent",
 		cancel: ":input",
 		delay: 0,
 		distance: 1,
 		dropOnEmpty: true,
 		forcePlaceholderSize: false,
+		forceHelperSize: false,
 		helper: "original",
 		items: '> *',
 		scope: "default",
@@ -909,14 +912,6 @@ $.extend($.ui.sortable, {
  * Sortable Extensions
  */
 
-$.ui.plugin.add("sortable", "axis", {
-	sort: function(event, ui) {
-		var i = $(this).data('sortable'), o = i.options;
-		if(o.axis == "y") i.position.left = i.originalPosition.left;
-		if(o.axis == "x") i.position.top = i.originalPosition.top;
-	}
-});
-
 $.ui.plugin.add("sortable", "cursor", {
 	start: function(event, ui) {
 		var t = $('body'), i = $(this).data('sortable');
@@ -943,47 +938,54 @@ $.ui.plugin.add("sortable", "opacity", {
 
 $.ui.plugin.add("sortable", "scroll", {
 	start: function(event, ui) {
-		var i = $(this).data('sortable'), o = i.options;
+		var o = ui.options;
+		var i = $(this).data("sortable");
 
-		i.overflowY = function(el) {
-			do { if(/auto|scroll/.test(el.css('overflow')) || (/auto|scroll/).test(el.css('overflow-y'))) return el; el = el.parent(); } while (el[0].parentNode);
-			return $(document);
-		}(i.currentItem);
-		i.overflowX = function(el) {
-			do { if(/auto|scroll/.test(el.css('overflow')) || (/auto|scroll/).test(el.css('overflow-x'))) return el; el = el.parent(); } while (el[0].parentNode);
-			return $(document);
-		}(i.currentItem);
-
-		if(i.overflowY[0] != document && i.overflowY[0].tagName != 'HTML') i.overflowYOffset = i.overflowY.offset();
-		if(i.overflowX[0] != document && i.overflowX[0].tagName != 'HTML') i.overflowXOffset = i.overflowX.offset();
+		if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') i.overflowOffset = i.scrollParent.offset();
 
 	},
-	sort: function(event, ui) {
+	drag: function(event, ui) {
 
-		var i = $(this).data('sortable'), o = i.options;
+		var o = ui.options, scrolled = false;
+		var i = $(this).data("sortable");
 
-		if(i.overflowY[0] != document && i.overflowY[0].tagName != 'HTML') {
-			if((i.overflowYOffset.top + i.overflowY[0].offsetHeight) - event.pageY < o.scrollSensitivity)
-				i.overflowY[0].scrollTop = i.overflowY[0].scrollTop + o.scrollSpeed;
-			if(event.pageY - i.overflowYOffset.top < o.scrollSensitivity)
-				i.overflowY[0].scrollTop = i.overflowY[0].scrollTop - o.scrollSpeed;
+		if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') {
+
+			if((i.overflowOffset.top + i.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity)
+				i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop + o.scrollSpeed;
+			else if(event.pageY - i.overflowOffset.top < o.scrollSensitivity)
+				i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop - o.scrollSpeed;
+				
+			if((i.overflowOffset.left + i.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity)
+				i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft + o.scrollSpeed;
+			else if(event.pageX - i.overflowOffset.left < o.scrollSensitivity)
+				i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft - o.scrollSpeed;				
+				
 		} else {
+						
 			if(event.pageY - $(document).scrollTop() < o.scrollSensitivity)
-				$(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
-			if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity)
-				$(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
+				scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
+			else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity)
+				scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
+
+			if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity)
+				scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
+			else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
+				scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
+
 		}
 
-		if(i.overflowX[0] != document && i.overflowX[0].tagName != 'HTML') {
-			if((i.overflowXOffset.left + i.overflowX[0].offsetWidth) - event.pageX < o.scrollSensitivity)
-				i.overflowX[0].scrollLeft = i.overflowX[0].scrollLeft + o.scrollSpeed;
-			if(event.pageX - i.overflowXOffset.left < o.scrollSensitivity)
-				i.overflowX[0].scrollLeft = i.overflowX[0].scrollLeft - o.scrollSpeed;
-		} else {
-			if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity)
-				$(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
-			if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
-				$(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
+		if(scrolled !== false && $.ui.ddmanager)
+			$.ui.ddmanager.prepareOffsets(i, event);
+
+
+
+		//This is a special case where we need to modify a offset calculated on start, since the following happened:
+		// 1. The position of the helper is absolute, so it's position is calculated based on the next positioned parent
+		// 2. The actual offset parent is a child of the scroll parent, and the scroll parent isn't the document, which means that
+		//    the scroll is included in the initial calculation of the offset of the parent, and never recalculated upon drag
+		if(scrolled !== false && i.cssPosition == 'absolute' && i.scrollParent[0] != document && $.ui.contains(i.scrollParent[0], i.offsetParent[0])) {
+			i.offset.parent = i._getParentOffset();
 		}
 
 	}
@@ -997,7 +999,7 @@ $.ui.plugin.add("sortable", "zIndex", {
 	},
 	beforeStop: function(event, ui) {
 		var i = $(this).data('sortable');
-		if(i.options._zIndex) $(ui.helper).css('zIndex', i.options._zIndex);
+		if(i.options._zIndex) $(ui.helper).css('zIndex', i.options._zIndex == 'auto' ? '' : i.options._zIndex);
 	}
 });