function search_submit()
{
   var search_type;
   search_type = document.search_form.search_type.value;
   
   if (search_type == "brand")
   {
      document.search_form.action = "/search_brand.php";
   }
   else if (search_type == "product")
   {
      document.search_form.action = "/search.php";
   }   
   //alert(search_type);
   
   document.search_form.submit();


}