Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/insitevi/public_html/crg-shop/mirror/category_tree.php on line 50

 $dbh=mysql_connect ("***", "***", "***") or die ('I cannot connect to the database because: ' . mysql_error());
mysql_select_db ("***");

mysql_query("SET NAMES 'hebrew'");


 class osC_CategoryTree {
   var $root_category_id = 0,
       $max_level = 0,
       $data = array(),
       $root_start_string = '',
       $root_end_string = '',
       $parent_start_string = '',
       $parent_end_string = '',
       $parent_group_start_string = '<ul  class="sitemap">',
       $parent_group_end_string = '</ul>',
       $child_start_string = '<li>',
       $child_end_string = '</li>',
       $spacer_string = '',
       $spacer_multiplier = 1;
 




  function osC_CategoryTree ($load_from_database = true) {
    
         $categories_query = mysql_query("SELECT * FROM categories,categories_description WHERE categories.categories_id = categories_description.categories_id ORDER by categories.parent_id, categories.sort_order,categories_description.categories_name");
        
        
       
        
        
         $this->data = array();
         
         
         while ($categories = mysql_fetch_array($categories_query)) {
         
     
       $this->data[$categories['parent_id']][$categories['categories_id']] = array('name' => $categories['categories_name'], 'count' => 0);
         }
   }

   function buildBranch($parent_id, $level = 0) {
     $result = $this->parent_group_start_string;

     if (isset($this->data[$parent_id])) {
       foreach ($this->data[$parent_id] as $category_id => $category) {
         $category_link = $category_id;
         $result .= $this->child_start_string;
         if (isset($this->data[$category_id])) {
           $result .= $this->parent_start_string;
         }

         if ($level == 0) {
           $result .= $this->root_start_string;
         }
         $result .= str_repeat($this->spacer_string, $this->spacer_multiplier * $level) . '<a title="'. $category['name'] . '" href="mirror.php?".$category_link.">';
         $result .= $category['name'];
         $result .= '</a>';

         if ($level == 0) {
           $result .= $this->root_end_string;
         }

         if (isset($this->data[$category_id])) {
           $result .= $this->parent_end_string;
         }

         $result .= $this->child_end_string;

         if (isset($this->data[$category_id]) && (($this->max_level == '0') || ($this->max_level > $level+1))) {
           $result .= $this->buildBranch($category_id, $level+1);
         }
       }
     }

     $result .= $this->parent_group_end_string;

     return $result;
   }

   function buildTree() {
     return $this->buildBranch($this->root_category_id);
   }
 }

mysql_close($dbh);

$osC_CategoryTree = new osC_CategoryTree; echo $osC_CategoryTree->buildTree();