One trick I used to post in (pre-nuked forums) Morpheus to lose the pop-ups AND kill the annoying ad in the bottom left corner is to add ads.musiccity.com to the restricted sites list in your internet options. For those who have forgotten, in IE go to Tools=>internet options=>Security. Highlight the restricted sites icon and click the Sites button. Add the above address, close all your open dialog boxes and POOF!
No more pop-ups OR left corner banner ads! Remember, this will only work in Morpheus. For all other sites, Pop-up Killer is needed. You can get it here:
http://software.xfx.net/utilities/popupkiller/