function CheckSelection(objSelBox, strCustMsgBox, msgType)
{
   var msgText;
   if(msgType = 'offer')
      msgText = 'To enter a custom offer, select CUSTOM from the Postcard Offer list shown above.';
   else
      msgText = 'To enter a custom message, select CUSTOM from the Postcard Message list shown above.';
   
   
   var objCustMsgBox = document.getElementById(strCustMsgBox);
   if(objSelBox.options[objSelBox.selectedIndex].value == 'CUSTOM' && objCustMsgBox)
   {
      objCustMsgBox.disabled = false;
      objCustMsgBox.style.backgroundColor = '';
      objCustMsgBox.value = '';
   }
   else if(objCustMsgBox)
   {
      objCustMsgBox.disabled = true;
      objCustMsgBox.style.backgroundColor = 'silver';
      objCustMsgBox.value = msgText;
   }

}