[kh99]

Originally Posted by Lloyd32552

Link1 will be descriptions of the software. Link2 will be a page with download links and installation instructions and Link3 will be the purchase links. All three pages will be static html pages.

So you're going to create those as CMS static pages and you want the menu to appear on those as well? Then I guess you're going to want to do something like:

if (in_array($vbulletin->nodeid, array(124, 125, 126, 127)))

or whatever the actual node ids turn out to be.

When I add:
if ($vbulletin->nodeid == 124)
{
sub-menu code
}

to my plugin, the Software Tab AND the Home tab is highlighted and the Home sub-menu is superimposed over the Software sub-menu.

I'm getting closer, though.

I guess that's some problem with the way you're adding your sub menu? To be honest I don't know how to do that offhand.