Hello BrianD - welcome to the forums.
If I understand you correctly, you should be able to use a real query string:
<li><a HREF="dnmc.asp?pagevalue=A" target="framebody">A - General </a></li>
There are probably other approaches specific to ASP as well. We've got a forum dedicated to IIS and ASP.NET [webmasterworld.com] where you can ask for that kind of input, too.