function textbox_keydown(e, id)
{
  var key = 0;
  if (typeof(e.keyCode) != 'undefined') {
    key = e.keyCode;
  } else if (typeof(e.which) != 'undefined') {
    key = e.which;
  }
  if (key == 0xd) {
    if (typeof(id) != 'undefined' && id != '') {
		document.getElementById(id).click();
    }
    return false;
  }
  return true;
}