Show sub menu on body class

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Hi all,

How can i show a hidden div on when the body class had a for example "about".

I use a Attribute to give the body a class.

This is the code i have now:

HTML
<body id="<?php echo $c->getCollectionAttributeValue('bodyclass')?>">


<div id="submenu">
                <span>
                    <img src="<?php echo $this->getThemePath()?>/images/subnav_arrow.png" alt="" /><a href="#">subnav link</a>
                    <img src="<?php echo $this->getThemePath()?>/images/subnav_arrow.png" alt="" /><a href="#">subnav link</a>
                    <img src="<?php echo $this->getThemePath()?>/images/subnav_arrow.png" alt="" /><a href="#">subnav link</a>
                </span>  
            </div><!-- end submenu -->


CSS
#submenu span {width:900px; height:auto; float:left; display:none; color:#000; margin: 0 0 0 20px; padding:5px}
#about #submenu span {display:block;}


thanks in advance!

EDIT: i have multiple body classes