The best place is the bin. Otherwise - it is more dependent on the pop-up html code given to you - its placement will be based on their rules.
bin - is the wastepaper basket that you throw trash into. As to where to place the code - as I said, it depends on the ad agency giving you the code. You need to ask THEM for THEIR instructions.
Than u very much for ur replies...any way i placed the code in foofter of evry page and i'm very happy with my earnings.. adversl is really good..their servers r really fast..high CPM..timely payment via paypal...i recommend all the newbies and senior memebers to try adversl once n see the results.. you can check my signature for adversl link..
never use popup they suck... uor forum members would not love them and they will irritate with them and go away
It is a matter of personal taste and marketing vision. Where do you want to show ads after some people have browsed your shop ? Just think realistic.