function Popup(url_pop)
    {
     var PopWidth=500;
     var PopHeight=300;
     var PopLeft=(window.screen.width-PopWidth)/2;
     var PopTop=(window.screen.height-PopHeight)/2;
Paz=window.open(url_pop,'Consultas','toolbar=no,status=no,menubar=no,location=no,directories=no,resizable=no,scrollbars=yes,width='+PopWidth+',height='+PopHeight+',top='+PopTop+',left='+PopLeft);
     }