jquery index() 问题

<div id="content"> 
<div class="bName"> 
    <ul> 
        <li><label>businessName:</label> businessNamesfsdfdsfsdfddfsdfsdfgsfd</li> 
        <li><label>businessKey:</label> businessKey</li> 
        <li><label>businessDescription:</label>businessDescription </li> 
        <span  class="slider"><a href="#" class="btn-slide">详细</a></span> 
    </ul> 
</div>

<div class="bName">
    <ul>
        <li><label>businessName:</label> businessNamesfsdfdsfsdfddfsdfsdfgsfd</li>
        <li><label>businessKey:</label> businessKey</li>
        <li><label>businessDescription:</label>businessDescription </li>
        <span  class="slider"><a href="#" class="btn-slide">详细</a></span>
    </ul>
</div>

<div>

当点击a标签时用jquery如何获得当前.bName 相对于#content的index？？