How to add a class to body tag?
<p>I want to add a class to a body tag with jquery.</p>

<p>For example if URL is 
    <a href="http://www.mywebsite.com/about%5Fus.asp" rel="nofollow">http://www.mywebsite.com/about_us.asp</a>
, I want add the first five letters, in this case 'about', to body tag 
    &lt;body class="about"&gt;
.</p>

<p>Can anyone help me please? </p>
