function popitup(url,wd,hg) {
	settings= "toolbar=no,location=no,directories=no,"+
              "status=no,menubar=no,scrollbars=no,"+
              "resizable=no,width="+wd+",height="+hg+", left="+((screen.width/2)-(wd/2))+", top=40";

    window.open(url,'mostrafoto',settings);
}