diff --git a/ui/jquery.ui.progressbar.js b/ui/jquery.ui.progressbar.js
index 08880aacf..b38d826f0 100644
--- a/ui/jquery.ui.progressbar.js
+++ b/ui/jquery.ui.progressbar.js
@@ -11,19 +11,15 @@
  *   jquery.ui.core.js
  *   jquery.ui.widget.js
  */
-(function($) {
+(function( $ ) {
 
-$.widget("ui.progressbar", {
+$.widget( "ui.progressbar", {
 	options: {
 		value: 0
 	},
 	_create: function() {
-
 		this.element
-			.addClass("ui-progressbar"
-				+ " ui-widget"
-				+ " ui-widget-content"
-				+ " ui-corner-all")
+			.addClass( "ui-progressbar ui-widget ui-widget-content ui-corner-all" )
 			.attr({
 				role: "progressbar",
 				"aria-valuemin": this._valueMin(),
@@ -31,89 +27,81 @@ $.widget("ui.progressbar", {
 				"aria-valuenow": this._value()
 			});
 
-		this.valueDiv = $('<div class="ui-progressbar-value ui-widget-header ui-corner-left"></div>').appendTo(this.element);
+		this.valueDiv = $( "<div class='ui-progressbar-value ui-widget-header ui-corner-left'></div>" )
+			.appendTo( this.element );
 
 		this._refreshValue();
-
 	},
 
 	destroy: function() {
-
 		this.element
-			.removeClass("ui-progressbar"
-				+ " ui-widget"
-				+ " ui-widget-content"
-				+ " ui-corner-all")
-			.removeAttr("role")
-			.removeAttr("aria-valuemin")
-			.removeAttr("aria-valuemax")
-			.removeAttr("aria-valuenow")
-			.removeData("progressbar")
-			.unbind(".progressbar");
+			.removeClass( "ui-progressbar ui-widget ui-widget-content ui-corner-all" )
+			.removeAttr( "role" )
+			.removeAttr( "aria-valuemin" )
+			.removeAttr( "aria-valuemax" )
+			.removeAttr( "aria-valuenow" );
 
 		this.valueDiv.remove();
 
-		$.Widget.prototype.destroy.apply(this, arguments);
-
-		return this;
+		$.Widget.prototype.destroy.apply( this, arguments );
 	},
 
-	value: function(newValue) {
-		if (newValue === undefined) {
+	value: function( newValue ) {
+		if ( newValue === undefined ) {
 			return this._value();
 		}
-		
-		this._setOption('value', newValue);
+
+		this._setOption( "value", newValue );
 		return this;
 	},
 
-	_setOption: function(key, value) {
-
-		switch (key) {
-			case 'value':
+	_setOption: function( key, value ) {
+		switch ( key ) {
+			case "value":
 				this.options.value = value;
 				this._refreshValue();
-				this._trigger('change', null, {});
+				this._trigger( "change" );
 				break;
 		}
 
-		$.Widget.prototype._setOption.apply(this, arguments);
-
+		$.Widget.prototype._setOption.apply( this, arguments );
 	},
 
 	_value: function() {
 		var val = this.options.value;
 		// normalize invalid value
-		if (typeof val != "number")
+		if ( typeof val !== "number" ) {
 			val = 0;
-		if (val < this._valueMin()) val = this._valueMin();
-		if (val > this._valueMax()) val = this._valueMax();
+		}
+		if ( val < this._valueMin() ) {
+			val = this._valueMin();
+		}
+		if ( val > this._valueMax() ) {
+			val = this._valueMax();
+		}
 
 		return val;
-
 	},
 
 	_valueMin: function() {
-		var valueMin = 0;
-		return valueMin;
+		return 0;
 	},
 
 	_valueMax: function() {
-		var valueMax = 100;
-		return valueMax;
+		return 100;
 	},
 
 	_refreshValue: function() {
 		var value = this.value();
-		this.valueDiv[value == this._valueMax() ? 'addClass' : 'removeClass']("ui-corner-right");
-		this.valueDiv.width(value + '%');
-		this.element.attr("aria-valuenow", value);
+		this.valueDiv
+			[ value === this._valueMax() ? "addClass" : "removeClass"]( "ui-corner-right" )
+			.width( value + "%" );
+		this.element.attr( "aria-valuenow", value );
 	}
-
 });
 
-$.extend($.ui.progressbar, {
+$.extend( $.ui.progressbar, {
 	version: "@VERSION"
 });
 
-})(jQuery);
+})( jQuery );