- },
-
- // A method for quickly swapping in/out CSS properties to get correct calculations
- swap: function( elem, options, callback ) {
- var old = {};
- // Remember the old values, and insert the new ones
- for ( var name in options ) {
- old[ name ] = elem.style[ name ];
- elem.style[ name ] = options[ name ];
+ };
+}
+
+if ( document.documentElement.currentStyle ) {
+ currentStyle = function( elem, name ) {
+ var left, rsLeft,
+ ret = elem.currentStyle && elem.currentStyle[ name ],
+ style = elem.style;
+
+ // From the awesome hack by Dean Edwards
+ // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
+
+ // If we're not dealing with a regular pixel number
+ // but a number that has a weird ending, we need to convert it to pixels
+ if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
+ // Remember the original values
+ left = style.left;
+ rsLeft = elem.runtimeStyle.left;
+
+ // Put in the new values to get a computed value out
+ elem.runtimeStyle.left = elem.currentStyle.left;
+ style.left = name === "fontSize" ? "1em" : (ret || 0);
+ ret = style.pixelLeft + "px";
+
+ // Revert the changed values
+ style.left = left;
+ elem.runtimeStyle.left = rsLeft;