YYZ, at the moment, the problem appears to be at your end. If you give us some information about what setup you are running then we can try and help.
I have tried with three separate browsers (IE6, Opera and Mozilla Thunderbird) and the advert works as expected for me.
The Mods had best sort it anyway or the advertisers will want some pennies back!
I don't have access to 'sort' anything, but if the advertisers are concerned then I suggest they click on the "contact us" link at the bottom of the page.