Try KillAd 0.10 or 0.11 (latest) - this is
freeware. You can find it at Nonags.com or the
guy's homepage (not recommended since his site
"makes a point" ^_^'''). I recommend this only
for veteran computer users as it will require
tweaking for best results ... (kill list, no-kill
list, window sizes, etc.) So far I've been able
to kill every Animanga-related popup.