function openWindow(url, ancho, alto)
{
    window.open (url, "win", "width=600,height=448,toolbar=no, location=no,directories=no,status=yes,menubar=no,scrollbars=yes,copyhistory=yes, resizable=no");
}
function openWindowImagenes(url, ancho, alto)
{
    window.open (url, "win", "width=668,height=472,toolbar=no, location=no,directories=no,status=yes,menubar=no,scrollbars=yes,copyhistory=yes, resizable=no");
}
function openWindowLOPD(url, ancho, alto)
{
    window.open (url, "win", "width=600,height=255,toolbar=no, location=no,directories=no,status=yes,menubar=no,scrollbars=yes,copyhistory=yes, resizable=no");
}