Why would this not work for me:
<table border="0" cellpadding="0" cellspacing="0" width="700">
<tr>
<td>
<!-- ----------Begin Top Navigation Include File---------- -->
<!--#include file="topnav.html"-->
<!-- ----------End Top Navigation Include File---------- -->
</td>
</tr>
</table>
Contents of topnav.html:
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td colspan="6"><img src="images/tophead.gif" width="700"
height="163" border="0" usemap="#Imagemap1">
<map name="Imagemap1">
<area shape="rect" coords="580,15,696,82"
href="http://linkedsite.com">
<area shape="rect" coords="271,69,452,83" href="index.html"
alt="Home" title="Home">
<area shape="poly"
coords="238,65,122,6,103,21,77,106,70,142,154,138, 187,136" href="index.html"
alt="Home" title="Home">
</map>
</td>
</tr>
</table>