Two immediate things:

Stop using FrontPage 5 to produce your pages. It bloats your code with lots of stuff you can do without.

Do something about the size of your graphics. A 400 x 300px image that is 190k in size is just rediculous.

Then look at putting all your JavaScript and CSS into their own seperate files which you link into your pages.

Embrace css and divs and get rid of your table based layout.