Usemap not working in Firefox

I have following HTML text to show an image that contains a link:

<img src="header.gif" alt="" width="900" height="47" usemap="#logoMap"/>
   <map name="logoMap">
     <area shape="Home" coords="795, 16, 870, 30" href="abc.htm"/>
   </map>

Problem is that usemap is not working in Firefox. It is working fine in IE 7.0. My image dimemsion is 900 X 47.

From stackoverflow

• In your area tag you have "Home" which is not a valid shape. Try "rect". That should do the trick.

  <img src="header.gif" alt="" width="900" height="47" usemap="#logoMap"/>
     <map name="logoMap">
       <area shape="rect" coords="795, 16, 870, 30" href="abc.htm"/>
  </map>