function DefaultButtonKeyPress(evt, thisElementName) 
{
    if(evt.which || evt.keyCode)
    {
        if ((evt.which == 13) || (evt.keyCode == 13))
        {
             //alert('post back href: ' +  document.getElementById(thisElementName).href);
            location = document.getElementById(thisElementName).href;
            return false;
        }
    }
    else
    {
         return true;
    }
}