CategoryCollapserPlugin::CategoriesController_Render_Before PHP Method

    public function CategoriesController_Render_Before($Sender)
    {
        $Sender->AddJsFile("category_collapse.js", "plugins/CategoryCollapser");
        $Style = Wrap('
      .Expando {
         float: right;
         background: url(plugins/CategoryCollapser/design/tagsprites.png) no-repeat 0 -52px;
         height: 16px;
         width: 16px;
         color: transparent;
         text-shadow: none;
         cursor: pointer; }
      .Expando-Collapsed .Expando {
         background-position: 0 -69px; }', 'style');
        $Sender->AddAsset('Head', $Style);
    }