function PopUp(myurl, myname, 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( myprop ) {
    if( attribs.indexOf( myprop ) == -1 ) {
      properties = properties + ',' + myprop + '=no';
    } else
      properties = properties + ',' + myprop + '=yes';
  }

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

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