function irA(menu,formu){
  var saltourl = menu.options[menu.selectedIndex].value;

  //saltourl = saltourl + formu.nombre.value + formu.passwd.value;
  //alert(saltourl);

  formu.action = saltourl;
}

function abrir_ventana(theURL,winName,features)
{
posx=((screen.availWidth-250)/2)
posy=((screen.availHeight-200)/2)
eval("boxwindow=window.open('recuerda_login.php','boxwindow','width=250,height=200,toolbar=0,directories=0,status=0,scrollbars=0,resize=0,menubar=0,screenx="+posx+",screeny="+posy+",left="+posx+",top="+posy+"')")
}