how to add and remove css class
<p>how to remove CSS default class</p>

<p>This is my div </p>

<pre><code>&lt;div id="messageContainer"&gt;
</code></pre>

<p>This is my css class</p>

<pre><code>#messageContainer{  
  height:26px;  
  color:#FFFFFF;    
  BACKGROUND-COLOR: #6af; 
  VERTICAL-ALIGN: middle;
  TEXT-ALIGN: center;
  PADDING-TOP:6px;  
}
</code></pre>

<p>I want to remove default class and new css class</p>

<p>Please help;</p>
