function stopSpam(formId)
{
   elem = document.getElementById(formId);

   if (elem == null) return true;
   if (elem.value == null) return true;

   if (elem.value.match("http://([\/~_\.0-9A-Za-z#&-]+)"))
     {
       elem.className += " ErrorClass";
       alert("We do not accept URLs for " + formId);
       return false;
     }
   return true;
}