PLEASE CLOSE; PROBLEM SOLVED

Ok well this is my very first website and i've spent a lot of time on it...
But i really want to make the content much smaller since i find 640px a bit to big

But everytime i try to change the size the sidebar goes to the bottem ...i've tried different things

http://www.freewebs.com/solar_dreams/index.htm

This is my website...feel freel to use the view source since the i left the CSS in that document as well for the time being until i finished.