Finding the actual computed value of a CSS Style Property on an Element

            // Get a style property (name) of a specific element (elem)
            function getStyle( elem, name )
            {
            // If the property exists in style[], then it's been set
            // recently (and is current)
            if (elem.style[name])
            {
            return elem.style[name];
            }
            // Otherwise, try to use IE's method
            else if (elem.currentStyle)
            {
            return elem.currentStyle[name];
            }
            // Or the W3C's method, if it exists
            else if (document.defaultView && document.defaultView.getComputedStyle)
            {
            // It uses the traditional 'text-align' style of rule writing,
            // instead of textAlign
            name = name.replace(/([A-Z])/g,"-$1");
            name = name.toLowerCase();
            // Get the style object and get the value of the property (if it exists)
            var s = document.defaultView.getComputedStyle(elem,"");
            return s && s.getPropertyValue(name);
            // Otherwise, we're using some other browser
            } else
            return null;
            }