Hi. I just discovered, just to chip in, that if you hand edit the menu, when you come to edit it again with the CSS Menu Writer wizard it will cause problems.
I had an eight button menu that I'd created by hand in the menu.asp file but when I opened the wizard it only displayed 3 buttons and I had to rebuild it all over again.
For your information though, here's a two button menu with a sub-menu beneath the second item:
<ul class="level-0" id="cssmw">
<li><a href="<%=assumedRoot%>index.asp">Home</a></li>
<li class="parent"><a href="<%=assumedRoot%>instruments.asp">Instruments</a>
<ul class="level-1">
<li><a href="<%=assumedRoot%>violin-instruments.asp">Violins</a></li>
<li><a href="<%=assumedRoot%>viola-instruments.asp">Violas</a></li>
<li><a href="<%=assumedRoot%>cello-instruments.asp">Cellos</a></li>
</ul>
</li>
</ul>
Hope that's useful anyway.
Regards
Nathon.