diff --git a/src/css.js b/src/css.js
index a6e2bb614..8a83c6072 100644
--- a/src/css.js
+++ b/src/css.js
@@ -12,6 +12,9 @@ var ralpha = /alpha\([^)]*\)/i,
 	cssHeight = [ "Top", "Bottom" ],
 	curCSS,
 
+	getComputedStyle,
+	currentStyle,
+
 	fcamelCase = function( all, letter ) {
 		return letter.toUpperCase();
 	};
@@ -169,6 +172,10 @@ jQuery.each(["height", "width"], function( i, name ) {
 				if ( val <= 0 ) {
 					val = curCSS( elem, name, name );
 
+					if ( val === "0px" && currentStyle ) {
+						val = currentStyle( elem, name, name );
+					}
+
 					if ( val != null ) {
 						// Should return "auto" instead of 0, use 0 for
 						// temporary backwards-compat
@@ -234,7 +241,7 @@ if ( !jQuery.support.opacity ) {
 }
 
 if ( document.defaultView && document.defaultView.getComputedStyle ) {
-	curCSS = function( elem, newName, name ) {
+	getComputedStyle = function( elem, newName, name ) {
 		var ret, defaultView, computedStyle;
 
 		name = name.replace( rupper, "-$1" ).toLowerCase();
@@ -252,8 +259,10 @@ if ( document.defaultView && document.defaultView.getComputedStyle ) {
 
 		return ret;
 	};
-} else if ( document.documentElement.currentStyle ) {
-	curCSS = function( elem, name ) {
+}
+
+if ( document.documentElement.currentStyle ) {
+	currentStyle = function( elem, name ) {
 		var left, rsLeft,
 			ret = elem.currentStyle && elem.currentStyle[ name ],
 			style = elem.style;
@@ -282,6 +291,8 @@ if ( document.defaultView && document.defaultView.getComputedStyle ) {
 	};
 }
 
+curCSS = getComputedStyle || currentStyle;
+
 function getWH( elem, name, extra ) {
 	var which = name === "width" ? cssWidth : cssHeight,
 		val = name === "width" ? elem.offsetWidth : elem.offsetHeight;