Interesting reading - helps to explain why pop-ups started to disappear.
http://news.cnet.com/Pop-up%20purvey...j=news.1024.20
I know that it is a fine line when one uses semantics but what is the difference between showing a pop-up for the competition when visiting a site and waiting for the visitor to view the next site before offering the advertisement? In both cases the content of a site has been used to present ads for the competition to visitors at the earliest opportunity.