function rollOver(img_name,src) {

	var shim = 'images/1px.gif';
	var shim_pattern	= /x\.gif$/i;
	var img = document[img_name];

	img.src=src;

	if (img.tagName=='IMG' && img.src.match(/\.png$/i) !== null){

		if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){

			var ieversion=new Number(RegExp.$1)
			
			if (ieversion<=6){

				img.style.width = img.width + "px";
				img.style.height = img.height + "px";
				img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
				img.src = shim;

			}

		}

	}
}