p.s. if you have stats counters on your pages , your just asking for troubles
same goes for iframes.. as much as i like some of the tools sponsors offer in iframes , its a dangerous game , as all it takes is one server to get hacked and every affiliate along the chain is now a zombie
I should elaborate here.
1 of the problems is programs like ZANGO that do keyword matching to find its victims. If your site is called
www.jhgsrdfg.com zango isnt going to know what or whom to popup.. if you have an iframe for a sponsor like lets say "Adult Friend Finder" , zango can now find this and spurn a popup to override your aff ref code.. so by simply having the iframe you are creating the popups.