window.addEvent('domready', function(){
  $$('.task_drag').addEvents(
  {
    'click': function()
    {
      $(this.id+' .task_list').setStyle('visibility', 'hidden');
      alert($(this.id+' .image_tree').src);
      $(this.id+' .image_tree').setProperty('src','http://cornernote.homeip.net:8080/cakephp/tasks/img/actions/tree_closed.gif');
      alert($(this.id+' .image_tree').src);
   }
  });
});