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AddEventHandler("iblock", "OnBeforeIBlockElementAdd",      array("MyEventHandlerClass", "IBlockElementAddCodeFromName"));
AddEventHandler("iblock", "OnBeforeIBlockElementUpdate",   array("MyEventHandlerClass", "IBlockElementAddCodeFromName"));


class MyEventHandlerClass
{
   function IBlockElementAddCodeFromName(&$arFields)
   {
      if (strlen($arFields["NAME"])>0)
      {
         $arFields["CODE"]=Translit::UrlTranslit($arFields["NAME"]);
      }
   }
}

class Translit

   function UrlTranslit($string)
   {
      $string = preg_replace("/+/", "pluse", $string);
      return $string;
   }
}