var dbtn_id = "";

function dbtn_click(id,event) {
  if ((event.keyCode && event.keyCode == 13) || (event.which && event.which == 13))
  {
   event.returnValue=false;
   event.cancel = true;
   document.forms[0].elements[id].click();    
   return false;   
  }
  return true;
}