var agt=navigator.userAgent.toLowerCase();
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));

if ( is_ie )
{
	for(var i=0;i<document.images.length;i++) {
		image=document.images(i)
		if(image.png!=null){
			image.style.filter="FILTER: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+image.src+"', sizingMethod='image')"
			image.src="img/transparente.gif";
		}
	}
}