function ExpandSitemapNode(nid) {
    var node = $('#N' + nid);
    var img = $('#I'+nid);
    if(node.is(':visible')){
        node.hide();
        img.attr('src', '/images/expand_more.gif');
        node.children('ul li').each(function() {
            ExpandSitemapNode($(this).attr('id').substring(1, $(this).attr('id').length));
        });
    }
    else{
        node.show();
        img.attr('src', '/images/expand_less.gif');
    }
}