add border-bottom to the li by jquery?
<pre><code>&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
&lt;li&gt;&lt;a target="_blank" href="#"&gt;test one&lt;/li&gt;
</code></pre>

<p>I only want to add the <code>border-bottom</code> to the third and sixth line? why the following code doesn't work?</p>

<pre><code>$(li:lt(2,5)).css('border-bottom','1px solid red');
</code></pre>
