function toggleChecked(oElement) { 
   oForm = oElement.form; 
   oElement = oForm.elements[oElement.name]; 
   if(oElement.length) { 
      bChecked = oElement[0].checked; 
      for(i = 1; i < oElement.length; i++) 
         oElement[i].checked = bChecked;
   }
}