/**
  * Link to a category Filter
  * @param Int $category
  * @param Boolean $fullLink
  * @return String (HTML)
  */
 function CategoryLink($categoryID, $fullLink = false)
 {
     $link = "";
     if ($fullLink) {
         $link .= "{$this->Link()}/?";
     }
     if ($categoryID) {
         $link .= "&" . AllMerchantsPage_Controller::get_category_param() . "=" . $categoryID;
     }
     return $link;
 }