function bubble(elem,url,params,anchor,title) {
   if (Element.visible('bubble')) {
    $('bubble').style.display = 'none';
   } else {
    $('bubble_heading').innerHTML = title;
    var oncomplete = function() {
      var b = new Element.Bubble(null,'bubble','bubble_close',anchor);
      b.init_close('bubble_close_over','bubble_close');
    }
    new Element.Update(elem,url,params,oncomplete);
   }
}