function afterAJAX(req, extra)
{
//req - XMLHttpRequest object
//extra - contains info as to what to do with req
if(extra.addMenuNodes)//extra is the whole menu object
    {//top level menu
    extra.XMLdoc=req.responseXML.documentElement;
    extra.addMenuNodes();
    }
else if(extra=='expand')
    {
    
    }
    
}