Help with CSS layout

After lurking here for a while I've decided to change my ways of using
html tables for layout and give css layout a go. It's going to be quite
a learning curve, but hopefully it will pay off in the end.

I've made a start, but have run into problems getting the footer
positioned on the 'page'. So far I have a banner across the top, then a
main section with 3 columns, but I can't get the footer section to
position below this main 3-column section.

Any chance of some pointers?

The test layout can be seen at

http://www.tsunami-site-design.co.uk...ss/test1.shtml

the css at

http://www.tsunami-site-design.co.uk/test/css/test1.css

I realise that the scripting so far is a pretty clunky and there's still
LOADS to do to make the most of css, but I have to start somewhere.

TIA

Al.

--
Alan Cole. E-mail: justal at lineone dot net
http://www.forces-of-nature.co.uk [Coastal Sports]
http://www.tsunami-site-design.co.uk [Website Design]
http://tinyurl.com/64xrd [Plusnet ISP]