alternative shows the radio content by jquery?
<p>the html structure:</p>

<pre><code>&lt;div id="test"&gt;
   &lt;form&gt;
   &lt;input type="radio" name="content"  class="s_code" checked="checked" /&gt;&lt;span&gt;code&lt;/span&gt;
    &lt;input type="radio" name="content"  class="s_book" /&gt;&lt;span&gt;book&lt;/span&gt;
    &lt;/form&gt;
   &lt;/div&gt;
 &lt;div class="contenta"&gt;
 &lt;a href="one/letter_A_1.html"&gt;A&lt;/a&gt;

&lt;a href="two/letter_B_1.html"&gt;B&lt;/a&gt;

&lt;a href="three/letter_C_1.html"&gt;C&lt;/a&gt;

&lt;a href="four/letter_D_1.html"&gt;D&lt;/a&gt;
&lt;/div&gt;
 &lt;div class="contentb"&gt;
 &lt;a href="1/letter_A_1.html"&gt;A&lt;/a&gt;

&lt;a href="2/letter_B_1.html"&gt;B&lt;/a&gt;

&lt;a href="3/letter_C_1.html"&gt;C&lt;/a&gt;

&lt;a href="4/letter_D_1.html"&gt;D&lt;/a&gt;
&lt;/div&gt;&lt;/div&gt;
</code></pre>

<p>now, is there a way to get when i checked the book radio, the <code>contentb</code> showing. the <code>contenta</code> is hidden. the default shows is <code>contenta</code>.</p>
