welcome和tv交換

  /**

  * Stops iframe loading, selects *Welcome* tab, removes other tabs, adds new ones.

  */

  function onTreeItemClick(item/*, node, e*/) {

  if (selectedItem === item) {

  return;

  }

  selectedItem = item;

  _stopIframe();

  tabs.selectChild(welcome);

  _removeOldTabs();

  _addNewTabs(item);

  }