You have access to his website? The thing is where trying to help but as of yet he has not give us any coding what-so-ever. So where fighting an uphill battle trying to sort out a site with no information. Impossible I think!

If you can provide us with some sort of coding we can help sort this issue out so that if it happens again you will know exactly what to do to sort this problem out.

Surely you have access to the website...? Whats your websites URL? Just paste it in here so we can view the source ourselves and figure out any bugs or glitches. They don't mind you posting your web site in the forums as long as it's for help and not spamming.

'margin' auto needs DOC type in IE. And what is your code. If you don't show your code, we can't find what the problem is. So, post your code. Insert the doc type in your html first. Try this:
If it not ok, post your code here.

Make sure you add <div class="clear"></div> afterwards or it could mess up any other floats you may have on your page.
<FAKE SIGNATURE>