Back when I was working out where I should host The Technoloy Circle, I was dabbling a little at website design. Frames were all the rage on the web up until a year or two ago and then everything stopped. I blame Google.
The article here explains why you should not include frames in your website, no matter how you hide them. Also, while I am on it. FLASH IS BAD!!!!
Why is it that every advertising agency think that a Flash site is cool. It's not, it takes long to load and the best thing to do when a site takes long to load, is to close it.