The developer should fix it. It's upside down (or downside up if your glass is half empty) in the latest IE.
i have a printer here that doesn't work with windows 7, i have software that doesn't work on vista, can i get my money back? NO
i now put clauses in my quotes, simply " i am programming for TODAY, what happens tommorrow you will need to pay me for" type words
its "shop window cleaner theory" , you pay someone to clean your shop window, it gets dirty you need to pay him again.
as for IE8, fine, but i'm not going to spend hours of time tweeking the css for that % of people and my clients don't want to pay for it either in my experience, personally i find IE8 with XP VERYYYYY stable as i have it on 2 of my laptops but i only test on current browsers.
tim