Highlight a select option using javascript
<p>I have a group list as select like that:</p>

<pre><code>&lt;select id="groups"&gt;

&lt;option value="g1"&gt;G1&lt;/option&gt;
&lt;option value="g2"&gt;G2&lt;/option&gt;
&lt;option value="g3"&gt;G3&lt;/option&gt;

&lt;/select&gt;
</code></pre>

<p>I have a contact list which basically contains:</p>

<pre><code>Name = group
============
Casper  G1-G2-G3
Andy    G1-G2
Mark    G2-G3 
</code></pre>

<p>When the user check the <code>checkbox</code> for <code>Casper</code>and click <code>Edit</code> button so <code>G1-G2 and G3</code> should be highlighted (Selected) in the group list. When I get the value of the group field in the contact list, all of the three groups come with comma <code>"G1-G2-G3"</code>. 
Your help is highly appreciated.
Thanks,</p>
