function popup(url, width, height, rola)	{						
	if (rola==""){rola="yes"}
	window.open(url,"_blank","resizable=no,toolbar=no,status=no,top=" + (window.screen.height - height)/2 + ",left=" + (window.screen.width - width)/2 + ",menubar=no,scrollbars=" + rola + ",width=" + width + ",height=" + height);
}
function validaMail(objMail){
	if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(objMail))) 
    { 
		email = false;
	} 
	else{
		email = true;
	}
	return email;
}