depending upon value of case change the value of radio button
<pre><code>&lt;select id="events" name="event" &gt;
  &lt;option selected="selected"&gt;Please Select an Event&lt;/option&gt;
  &lt;option value="1"&gt;Event1&lt;/option&gt;
  &lt;option value="2"&gt;Event 2&lt;/option&gt;
  &lt;option value="3"&gt;Event 3&lt;/option&gt;
  &lt;option value="4"&gt;Event 4&lt;/option&gt;
&lt;/select&gt;
&lt;script type="text/javascript" src="js/jquery.js"&gt;&lt;/script&gt;

&lt;br&gt;&lt;br&gt;
&lt;span&gt;Tickets Required ?&lt;/span&gt;&lt;br&gt;&lt;br&gt;
&lt;input type="radio" name="sex" value="female" id="valf"&gt;&lt;span&gt;LADIES x 1 TICKET&lt;/span&gt;&lt;span&gt;{5 Seats Remaining for this event}&lt;/span&gt;&lt;br&gt;
&lt;input type="radio" name="sex" value="male"   id="valm"&gt;&lt;span&gt;GENTS x 1 TICKET&lt;/span&gt;&lt;span&gt;{12 Seats Remaining for this event}&lt;/span&gt;
&lt;br&gt;&lt;br&gt;

&lt;span&gt;TOTAL:&amp;nbsp; 12$&lt;/span&gt;&lt;br&gt;&lt;br&gt;
</code></pre>

<p>Depending upon the selected event change the value of input radio button and depending upon selected radio buttons display the price in total field</p> 

<pre><code>&lt;script type="text/javascript"&gt; 
$('#events').change(function()
{
    var selevent=$('#events').val();
    switch (selevent)
    {
       case '1': alert('You selected 1');
                 'Change Value Code of Radio button'
                  At the same time Show total
              break;
       case '2':  alert('You selected 2');
                  break;
       case '3':  alert('You selected 3');
                  break;
    }
});
</code></pre>
