Honestly, best idea would be to use another browser like opera or mozilla, both come with thier pop up blockers and have a control to allow pop up's on selected sites if you choose.
However if you want to stay with IE, then there honestly as long as it works, then that is what matters, because your just stopping pop up's, if it fails then it's no good imo.
But if your after features like those browsers have with allowing pop up's like for here for maybe a new pm,
http://www.webattack.com/Freeware/mi...popblock.shtml
Try one of those.
However this one is one i've used and enjoyed till i finally switched from IE.
http://www.analogx.com/contents/down...etwork/pow.htm
Works great and it's free, can't beat that imo. It has plenty of control over what is allowed and what isnt.