自定义的jQuery侧边栏菜单accordion，可展开二级，1级也可加链接

<script type="text/javascript">
$(function(){
$("#aside").creatAside(0);
});
$.fn.creatAside = function(firstOpen){
//为每个节点加上样式
__section  = $(this).children();
__schild = __section.children(":first-child");
__h3 = __section.children("h3");
__a = __section.children("a");
__ico = __schild.children("div");
__title = __schild.children("p");
__childnote = __section.children("ul");
__item = __childnote.children("li");

__section.addClass("aside_node");
__schild.addClass("aside_button");
__ico.addClass("aside_ico");
__title.addClass("aside_title_text");
__childnote.addClass("aside_note");
__item.addClass("aside_button");

//收缩所有节点、标记无子节点单位
__childnote.hide();
__schild.click(function(e) {
if(!$(this).hasClass("aside_button_select"))
{
__schild.removeClass("aside_button_select");
__schild.next("ul").slideUp();
$(this).addClass("aside_button_select");