Calling a JS function from onNodeLinkClicked in a Tree?

[Amanda Pacheco]

Hi all,
I'm using a Tree for navigation and I have a need to load an external page in a 
new window when a link is clicked in the tree.  I was hoping to put something 
in the onNodeLinkClicked function for my tree that could create/call a JS 
function to load the URL in a new window as required.  This does not need to be 
done for the entire tree structure, so I need to be able to set up this 
functionality for specified nodes only.  Is there a way to do this?

I have read the JS related article on the wiki 
(http://cwiki.apache.org/WICKET/calling-javascript-function-on-wicket-components-onclick.html),
 but I don't see how to add this to only a few nodes in a tree.

Here's my tree definition:

private Tree getTree()
{
  final Tree linkTree = new Tree("navTree", createNavigationTreeModel())
  {
    private static final long serialVersionUID = -4646756742893751770L;

    @Override
    protected void onNodeLinkClicked(AjaxRequestTarget target, TreeNode node)
    {
      // If this is a MenuItem, reload content.
      if (((DefaultMutableTreeNode) node).getUserObject() instanceof MenuItem)
      {
        MenuItem menuItem = (MenuItem) ((DefaultMutableTreeNode) 
node).getUserObject();
        Panel contentPanel = menuItem.getContent();
        contentPanel.setOutputMarkupId(true);

        MenuPanel.this.getParent().replace(contentPanel);
        target.addComponent(contentPanel);
      }
      else if (((DefaultMutableTreeNode) node).getUserObject() instanceof Menu)
      {
        Menu menu = (Menu) ((DefaultMutableTreeNode) node).getUserObject();

        // Use Javascript to open new window?  Get URL from menu object.
      }

      getTreeState().selectNode(node, true);
      super.onNodeLinkClicked(target, node);
    }
  };

  linkTree.setRootLess(true);
  linkTree.setOutputMarkupId(true);
  return linkTree;
}

The if(MenuItem) replace portion works great, it's the else if(Menu) part that 
has me stuck.  Thanks in advance for any suggestions or comments.
-- Amanda