评论框的内容如何用js隐藏和显现

评论框的内容怎么用js隐藏和显现？

<ul id="answers">

			 <li class="ans">

			 	<a href="#">answers1:</a><span class="blankspace">&nbsp;&nbsp;</span><span class="a_context">我是回答我是回答谁啊三等奖啊士大夫花括号地方了三sdkjhfskladhfksldhflksdhfkshflsdhfsldjhfsdljhfsdlkjhfsdkljhf</span>

			 	<ul class="a_inf group">

			 		<li><span class="a_time fleft">2012-11-14  18:22</span><a href="#" class="fright a_comment">评论[1]</a></li>

			 			<ul class="comments">

			 			<li><a href="#">xyp</a>:<span class="comment_content">sdfihdsklhfldskhdlskhgfdlkhgdfklshgsl评论一下</span></li>

			 			<li><a href="#">xyp</a>:<span class="comment_content">sdfihdsklhfldskhdlskhgfdlkhgdfklshgsl评论一下</span></li>

			 			</ul>

			 	</ul>

			 </li>

              <li class="ans">

			 	<a href="#">answers1:</a><span class="blankspace">&nbsp;&nbsp;</span><span class="a_context">我是回答我是回答谁啊三等奖啊士大夫花括号地方了三sdkjhfskladhfksldhflksdhfkshflsdhfsldjhfsdljhfsdlkjhfsdkljhf</span>

			 	<ul class="a_inf group">

			 		<li><span class="a_time fleft">2012-11-14  18:22</span><a href="#" class="fright a_comment">评论[1]</a></li>

			 			<ul class="comments">

			 			<li><a href="#">xyp</a>:<span class="comment_content">sdfihdsklhfldskhdlskhgfdlkhgdfklshgsl评论一下</span></li>

			 			<li><a href="#">xyp</a>:<span class="comment_content">sdfihdsklhfldskhdlskhgfdlkhgdfklshgsl评论一下</span></li>

			 			</ul>

			 	</ul>

			 </li>

代码如上，评论的锚点怎么和评论框的ul联系在一起？怎么用比较简洁的代码找到相应的<a>和<ul>？
------解决方案--------------------
这样？？

<ul id="answers">

             <li class="ans">

                 <a href="#">answers1:</a><span class="blankspace">&nbsp;&nbsp;</span><span class="a_context">我是回答我是回答谁啊三等奖啊士大夫花括号地方了三sdkjhfskladhfksldhflksdhfkshflsdhfsldjhfsdljhfsdlkjhfsdkljhf</span>

                 <ul class="a_inf group">

                     <li><span class="a_time fleft">2012-11-14  18:22</span><a href="#" class="fright a_comment">评论[1]</a></li>

                         <ul class="comments">

                         <li><a href="#">xyp</a>:<span class="comment_content">sdfihdsklhfldskhdlskhgfdlkhgdfklshgsl<a href="#" onclick="OpenTextarea(this)">评论一下</a></span></li>

                         <li><a href="#">xyp</a>:<span class="comment_content">sdfihdsklhfldskhdlskhgfdlkhgdfklshgsl<a href="#" onclick="OpenTextarea(this)">评论一下</a></span></li>