function KeyCheck(myfield,e)  {
  var keycode;
  if (window.event) keycode = window.event.keyCode;
  else if (e) keycode = e.which;
  else return true;
  if (((keycode>47) && (keycode<58) )  || (keycode==8) || (keycode==9))
    {
    return true;
    }
  else return false;
}