I had used a table based design for years, and I had good rankings on all of my keywords. Recently i changed over to a pure css design including the use of h1 tags, divs instead of cells, the whole works.

When the site was finished I uploaded it to the web and waited. A week later my rankings started dropping. First they dropped in google. Then they started dropping in yahoo. Msn has been fine, but who cares.

Can anyone tell me what I've done wrong?
The new site can be seen at http://pebblez.com
One page of the old site can be seen at http://pebblez.com/index2.html

I really appreciate any advice you can give me. Thanks