function showCode(obj) {
  var width  = 500;
  var height = 175;
  var left = Math.floor( (screen.width - width) / 2);
  var top = Math.floor( (screen.height - height) / 2);
  var params = 'top=' + top + ',left=' + left + ',width=' + width + ',height=' + height + ',scrollbars=no,toolbars=no';
  var win = window.open(obj.href, 'code', params);
  if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
  return false;
}