//POPUP function
function popup(url) {
	iz=(screen.width-700) /2;
	de=(screen.height-500) / 3;
	newwindow=window.open(url,'Imagen','height=500,width=700,scrollbars=yes,location=no,left=' + iz + ',top=' + de);
	if (window.focus) {newwindow.focus()}
	return false;
}

function borraMsg(obj)
{
	document.getElementById(obj).style.display = 'none';
}