Form, dynamic display elements
<p>I have this form:        </p>

<pre><code>&lt;form&gt;
        &lt;div class="box"&gt;
            &lt;h1&gt;Contact form :&lt;/h1&gt;
            &lt;label&gt;
                &lt;span&gt;Typ: &lt;/span&gt;
                &lt;input type="radio" name="typ" value="admin" /&gt;admin&lt;br /&gt;
                &lt;input type="radio" name="typ" value="user" /&gt;user&lt;br /&gt;
            &lt;/label&gt;
            &lt;label&gt;
                &lt;span&gt;E-mail :&lt;/span&gt;
                &lt;input type="text" class="post" name="email" id="email"/&gt;
            &lt;/label&gt;
            &lt;label&gt;
                &lt;span&gt;Subject :&lt;/span&gt;
                &lt;input type="text" class="post" name="subject" id="subject"/&gt;
            &lt;/label&gt;

            &lt;label&gt;
                &lt;span&gt;If admin :&lt;/span&gt;
                &lt;input type="text" class="post" name="ifadmin" id="ifadmin"/&gt;
            &lt;/label&gt;

        &lt;/div&gt;
    &lt;/form&gt;
</code></pre>

<p>How to do something like that: if I choose the first radio "admin" is displayed dynamically with jquery the "ifadmin" and if I choose "user" is not displayed?</p>
