哪位高手能帮帮小弟我把这段代码由mootools转成jq的

谁能帮帮我把这段代码由mootools转成jq的？
这段代码其实是用来高亮导航和显示子菜单的：
html代码结构大概如下：

<ul class="GoodsDropNavs">

    <li class="n-cat-depth-1 nobg">

        <a class="depth-1" href="./">

            <em>

                首页

            </em>

        </a>

    </li>

    <li class="n-cat-depth-1">

        <a class="depth-1" href="/browse/category-16.html">

            <em>

                童装

            </em>

        </a>

        <table cellpadding="0" cellspacing="0" border="0" class="n-cat-popup"

        style="display:none;">

            <tr>

                <td class="n-cat-drop-2">

                    <ul>

                        <li class="n-cat-depth-0">

                            <span>

                                功能分类

                            </span>

                        </li>

                        <li>

                            <a href="/browse/category-26.html">