wp125 IE border issue

I’ve installed wp125 on my blog and it looks and works great. Except that in IE7 it puts a purple border around the ads and even the ads that aren’t there. Like, if I have it set to allow 6 ads and I have only 3 installed. The other 3 blank spots have a border. I can get rid of the border in Firefox/Safari, but IE7 won’t budge. What am I missing?

Here’s my blog…