I can see several things that you should work on first:
1. Your code needs to be heavily commented, e.g. 'What we are doing here and why we are doing it?'
2. Most of us use descriptive names (at least as much as possible) for images, buttons, etc., such as 'frames_page1_over.gif' rather than the cryptic "Navigation_r7_c1_f3.gif" type filenames you are using. Makes it much easier to see at a glance what's going on.
3. Get rid of the spaces in filenames and directories. You can spot these by the '%20' items in the source code of the page. Some servers don't mind spaces; most do, and do funny things when they run across them. The major source of troubles like this is space names in directories - don't use them - use an underscore ( _ ) instead.
4. Your popups popup right over the existing menu items. Part of the problem is the focus of the mousepointer. This is going to be a problem with the width of your nav frame.
A few comments on your design and such (and they are worth exactly what you're paying for them! so do not take offense - they are just from MY perspective).
StudioMX (Dreamweaver) is full of goodies (I use it too). However, just because the goodies are available doesn't mean you should use them. A design philosophy I try to follow is to get done what I want in the most effective, accessible and easiest way possible. I think you've made your project more difficult for yourself than it needs to be, in terms of debugging and so on.
Frames-based design is on its way out. I believe that frameset definitions are going to go the way of the dinosaur before long, mainly because for the most part there are usually far easier and more elegant ways of presenting your page. Frames are needlessly complicated and time-consuming to debug (as you are finding out). For instance, you could use a template on your site that includes the header and navbar, with content in the righthand section. You would achieve the same look and functionality, but lose all the problems.
Having said that, I realise that you are a student and you probably need to learn frames and such. But I'll wager that as you move on, you'll lose your enthusiasm for them...