Change Timezone After Ad Created?

I've been setting up ads on AdCenter over the past 2 days. I went back to check my ads out today and noticed I set the wrong timezone on a couple ads, but after you set your timezone originally you don't have the option to change it or maybe you do and I'm not seeing it. This is the first time I've used AdCenter so it was inevidable that I'd have a snafu or 2. Anybody...Lil Help?

What's up with AdCenter and the Help Buttons? I'm using FF with the IE Rendering Engine. I can access the AdCenter site this way, but the help doesn't work. Is it the same with a regular version of IE?

Scratch that...Help does work with a regular version of IE...

So I was all over MSN's various AdCenter help sites and found nothing that would fix this. I couldn't even find a forum that mentioned time zones. Is it possible I am the only person who has run into this issue? Unlikely..

I found precious little info or support for AdCenter. So in the end I deleted my ads and recreated them. I'm glad I didn't have a lot that would have been tedious.

If anyone has a better option please post it here.