function PopUp(url, name, w, h, attribs)
{
  var wnd_l = (screen.availWidth - w) / 2;
  var wnd_t = (screen.availHeight - h) / 2;

  var properties = 'height=' + h + ',width=' + w + ',top=' + wnd_t + ',left=' + wnd_l;

  function AddPropertie(prop)
  {
    if (attribs.indexOf(prop) == -1)
    {
      properties = properties + ',' + prop + '=no';
    }
    else
      properties = properties + ',' + prop + '=yes';
  }

  AddPropertie('resizable');
  AddPropertie('locationbar');
  AddPropertie('menubar');
  AddPropertie('status');
  AddPropertie('scrollbars');

  var wnd = window.open(url, name, properties);
  if (parseInt(navigator.appVersion) >= 4)
  {
    wnd.window.focus();
  }
}