The main navigation bar's colors don't have enough contrast. The page doesn't scale. It looks nice on my widescreen monitor, but on a 4:3 ratio it's going to look funny.
The page width changes from page to page, which doesn't give off the static look you're going for.
Don't use tables unless you're using it as an excel spreadsheet. I'm sure you most likely don't know code all that well, but tables are a nightmare. My advice would be to use divs and spans customized with CSS to do what you want.
Your CSS shouldn't be named just 'style1', 'style2', style3', etc. When you're going back to edit the page or styles, it's going to be pain to figure out what style you're dealing with goes where.
The idea of CSS is to separate the content (text / pictures / etc.) from the customization and structure. As it is, look at your source code and editing something is a pain in the ass.
If you want to improve upon what you're doing, and understand what Dreamweaver is laying down in the way of code, you can go here:
http://www.w3schools.com/Start with the HTML / XHTML / CSS sections and work with them. After that I'd recommend the javascript, HTML DOM, and DHTML.