function popup(url) {
	newWin=window.open(url,"bienvenidoacasa","resizable=yes,scrollbars=no,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no, width=1024, height=660");
	//newWin.resizeTo(1024, 660);
	newWin.moveTo((window.screen.availWidth-1024)/2,0);
	if(document.layers) { 
		window.location.href=url; 
	}
	newWin.focus();
}