There are a couple of options for that.
You could try learning ‘floats’, which a lot of people get discouraged by. I was in the middle of writing an article regarding floats, but ended up stopping half-way through. It’s hard to explain, but here are some articles that are written by others:
http://www.pmob.co.uk/temp/3colfixedtest_sourcenone.htm (example)
http://www.bigbaer.com/css_tutorials/css.float.html.tutorial.htm
Floats are discouraging, but they can help you improve your code and search engines will respond to that.
The other way would be absolute positioning the sections of your website, but a lot of times, absolutely positioned websites will break on different screen resolutions and operating systems.