Hey,
Assuming there is to be more than more link in this menu it would make sense to use an unordered list, thereby doing away with both menu divs. The submenu id can be applied directly to the <ul> element.
<ul id="submenu">
<li>
<a href="http://www.numyspace.co.uk/%7Eunn_t005763/" class="top_parent">Homepage</a>
</li>
<li>
<a href="#" class="top_parent">Another Link</a>
</li>
<li>
<a href="#" class="top_parent">Yet another Link</a>
</li>
</ul>
Your CSS would then be something along the lines of:
#submenu {
background:transparent url(images/navbar.jpg) repeat-x;
height:29px;
width:100%;
list-style: none;
}
#submenu li{
width: 100px;
float: left;
}
I've not checked this so there may be issues, but this is much better way to build a menu.
Theres more at
http://www.webcredible.co.uk/user-friendly...tion-menu.shtml
Shout if you have any problems.