CSS help

Hi, I'm currently creating a website and I'm having a bit of a problem.

I'm trying to put two divs side by side without the use of tables but  
I can't get it to work.
The two divs are inside another div which holds the content of the  
page and is centred with the use of margins.
When I use the float properties for the two divs, they are placed side  
by side but it seems like they're taken out of the content div.

I hope W3C have people who can solve my problem and any help would be  
greatly appreciated.

Thanks in advance

Tze