I'm looking at this, too. The code looks pretty good to me so far, although I wouldn't claim to be an expert with frames. Right now it seems to me to be a problem with correctly rendering the .png file from main.html to the home page.

Could you post your css code?

BTW, you can use css to prevent blocks from scrolling Here's one that's humorous and nicely done:

http://cssplay.co.uk/layouts/frame.html