how i can replace style with new one using jquery
<p>i am inserting below css using jquery into head tag but problem is everytime i change the color using user interface it add another style tang and than css how can i remove already added and replace with new css please help.</p>

<pre><code>&lt;style charset="utf-8" type="text/css"&gt;div.contentMid2{background:#000;}div.module{background:#fff;}&lt;/style&gt;
</code></pre>

<p>want to add couple of css on runtime but replacing with already added.  </p>
