点击按钮显示隐藏div

//测试点击按钮div出现，再次点击div关闭
<script type="text/javascript">
function ClickMenu(diving) {
//alert(diving);
if (document.getElementById(diving).style.display == "none") {
document.getElementById(diving).style.display = 'block';
}
else {
document.getElementById(diving).style.display = 'none';
}
}
</script>
<div class='banner2'>
<img src='images/plus.gif' height='15' width='15' border='0' alt='' />
<a onclick="ClickMenu('TreeNode0')">分行管理</a>
</div>
<div id='TreeNode0' class='bannermid' style='display:none'>"
<div class='banner3'>

级东南风不可当老板
</div>
</div>