public static function checkItemBlacklist($item)
 {
     if ($item == NULL) {
         return;
     }
     $blacklist = SettingsClass::getItemBlacklist();
     $id = $item->getItemId();
     $damage = $item->getItemDamage();
     foreach ($blacklist as $listed) {
         if ($listed->id == $id) {
             if ($listed->damage == -1 || $listed->damage == $damage) {
                 echo '<br /><center><font size="+2" color="red">Sorry, you cannot sell this type of item.</font></center><br />';
                 exit;
             }
         }
     }
 }