var Ajax;
if (Ajax && (Ajax != null)) {
	Ajax.Responders.register({
	  onCreate: function() {
        if($('spinner') && Ajax.activeRequestCount>0)
          Effect.Appear('spinner',{duration:0.5,queue:'end'});
	  },
	  onComplete: function() {
        if($('spinner') && Ajax.activeRequestCount==0)
          Effect.Fade('spinner',{duration:0.5,queue:'end'});
	  }
	});
}

var GB_reload_show = function(caption, url, /* optional */ height, width, callback_fn) {
    var options = {
        caption: caption,
        height: height || 500,
        width: width || 500,
        fullscreen: false,
        callback_fn: callback_fn,
        reload_on_close: true
    }
    var win = new GB_Window(options);
    return win.show(url);
}