function popUp(url_used,w,h) {
	day = new Date();
	id = day.getTime();
	var LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	var TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	eval("page" + id + " = window.open(url_used, '"+id+"', 'dependent=1,toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=0,left='+LeftPosition+', top='+TopPosition+',width='+ w +',height=' + h);");
}