function fetchAll()
 {
     $cats = new categories();
     $cats->parent = 0;
     $cats->find();
     while ($cats->fetch()) {
         $this->cat_names[$cats->id] = $cats->name;
         $this->cats[$cats->id] = 0;
         $cats2 = new categories();
         $cats2->parent = $cats->id;
         if ($cats2->find()) {
             $this->cats[$cats->id] = array();
             while ($cats2->fetch()) {
                 $this->cat_names[$cats2->id] = $cats2->name;
                 $this->cats[$cats->id][$cats2->id] = 0;
                 $cats3 = new categories();
                 $cats3->parent = $cats2->id;
                 if ($cats3->find()) {
                     $this->cats[$cats->id][$cats2->id] = array();
                     while ($cats3->fetch()) {
                         $this->cat_names[$cats3->id] = $cats3->name;
                         $this->cats[$cats->id][$cats2->id][$cats3->id] = 0;
                     }
                 }
             }
         }
     }
     $temp = $this->cats;
     $this->cats = array();
     $this->cats[] = $temp;
 }