clear checked radio button value from form
<p>I have this piece of code which represents a few radio buttons.</p>

<pre><code>&lt;label&gt;Tipologia Pdv: &lt;/label&gt;
&lt;input type="radio" name="tipologia_pdv" id="tipologia_pdv" value="Iper" style="width:40px;" /&gt;&lt;span &gt; Iper&lt;/span&gt;
&lt;input type="radio" name="tipologia_pdv" id="tipologia_pdv"
value="Super" style="width:40px;" /&gt;&lt;span &gt; Super&lt;/span&gt;
</code></pre>

<p>Then, i have this code which clears the value, but it doesnt work with radio buttons: </p>

<pre><code>  $("#tipologia_pdv").val('');
</code></pre>

<p>Now, how would i get the to clear the checked value here? 
I assign the checked value with this and it works:</p>

<pre><code>var js_tipologia_pdv = $('input:radio[name=tipologia_pdv]:checked').val();
</code></pre>
