Newbie - Jquery won't align right

Newbie - Jquery won't align right

I'm using Dreamweaver MX, but I have only a very basic understanding of html. I finally got Jquery in the right place on my page, but then I made a mess when I tried to add more tabs. I couldn't figure out how to re-align everything, so in desperation I removed the sample markup and reloaded it. But every time I reload the sample markup, there are still pieces all over the place. I even re-loaded the code in the Head section, but Jquery parts are still scattered around the page.

When I first tried to load Jquery, I really had a hard time with alignment. I finally got it in the right place, but I still don't understand how to position it on my page. Any hints would be much appreciated.

I'm doing this for a friend. Please somebody help.