Here is what I used for my Site Message and works good.
<p><img border="0" alt="" width="971" height="467" usemap="#Map" src="/imagesupload/cms_files/Group Billlboard.jpg"><map id="Map" name="Map"><area shape="rect" coords="21,407,567,458" href="http://www.facebook.com/Luxehat"><area shape="rect" coords="723,293,945,461" href="http://luxehats.com/page.php?News=3"></map></p>
also see attached image