<!--
  function Ventana(cual, nombre, w, h, scroll) {
    var winl = (screen.width - w) / 2;
    var wint = (screen.height - h) / 2;
    winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable';
    win = window.open(cual, nombre, winprops);
    if (parseInt(navigator.appVersion) >= 4) { 
      win.window.focus(); 
    }
  return true;
  }
  
// -->