Theme question

Hey guys

Ok I need some help. Here’s the URL
http://74.86.66.197/~threedes/

I understand that every page off the global navigation (ie along the top of the site) runs off the single.php file. Not all the pages along the global navigation are going to be the same – but yet all run off single.php. ie I would like inside the DESIGN page to have a different sidebar (with a list of all the projects) than say I will have inside Profile. Is this possible?

Any advice would be much appreciated?

To summarise
I’d like to have different side bars in each of the pages on the global navigation. How do I do it!?

Thanks