function popUp (url,ancho,alto)
{
     var y= (screen.height-alto)/2;
     var x= (screen.width-ancho)/2;
     window.open (url,"Recomendar","toolbar=no,menubar=no,location=no,scrollbars=auto,resizable=no,left="+x+",top="+y+",width="+ancho+",height="+alto+"")
}
function stripHTML(cadena)
{
    return cadena.replace(/<[^>]+>/g,'');
}