Shopping cart layout help - Please!

Hello... I am attempting to add a custom right hand bar to my shopping cart page (like in my product info pages Here).

Unfortunately, I cannot figure out how to get it done nicely - I am a relative noob to manipulating layouts having taken it over from my dearly missed tech guy but managed to get the above one working.

You can check out my current shopping cart page by adding the above item to the cart.

Also, I managed to get something nice done in my dev site with a test sidebar in Firefox 3, but it will not render correctly in IE.

Any help would be mightily appreciated!

Thanks,
Ken

P.S. You can look at the dev site here by replacing the $$ signs with the appropriate letters - I just don't want crawlers hitting it: h$$p://shopdev1.rompalicious.c$$/index.php?main_page=product_info&cPath=40&products_id=117