Synchronized banners

Hi there,

I need to create a banner campaign where we have 2 banners on the page (one 468x60 plus one skyscraper) and i need to sync them up as in need to make sure they will start exactly at the same time when a user visits the page. I’m wondering if anyone has created something like that here and if so i would be rather grateful for some advice on how to do this or what is the best way to do it…

Thanks very much in advance,

pasillas