function getkey(e)
{
  var code;
  if (!e)
    var e = window.event;

  if (e.keyCode)
    code = e.keyCode;

  else
    if (e.which)
      code = e.which;

  return code;
}

function numeric(eX)
{
  var ret = false;
  
  test = getkey(eX);
  if( test >= 48 && test <= 57 ) ret = true;
  if( test == 9 || test == 8 || test == 13 || test == 37 || test == 39 || test == 46 ) ret = true;
  
  return ret;
}