function imgbck(el, type, hover)
{
	if (!el.imgbcked && (/\.png/.test(el.currentStyle.backgroundImage))) 
	{
		el.imgbcked = 1;
		type=type!=undefined&&type ? type : "crop";
        hover=hover!=undefined ? hover : false;
		//type="crop";
		var bg	= el.currentStyle.backgroundImage;
		var src = bg.substring(5,bg.length-2);
        el.style.background = "transparent";
		el.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod='"+type+"', src='"+src+"');";
        if(hover){
            path = src.split('/');
            path[path.length-1] = undefined;
            hover = path.join('/')+hover;
            el.onmouseover = function(){
                el.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod='"+type+"', src='"+hover+"');";
            }
            el.onmouseout = function(){
                el.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod='"+type+"', src='"+src+"');";
            }
        }
    }
}