Well, your website was obviously designed to be viewed on an 800 pixel wide screen... so it looks bad when viewed in a larger window. That's probably the first and easiest thing to fix from a "design" standpoint.

You should have a "doctype" tag... in fact, it should be the very first line.

You should run your website through a validation program (like this one: http://validator.w3.org/) and fix every single bug that it finds. It currently reports that you have 582 errors in your code... so you've got your work cut out for you. It's worth the trouble, especially if you want your website to work on every combination of (user) operating system and browser.

For some reason, you've got an extra "head" section pasted at the bottom of your code. Simply deleting those last sixty or so lines will help a lot.