Here's a little code snippet solution for Popup Killer software:
var Win = window.open(url,"popup","menu=no")
if (Win == null)
If the new window is "killed" because of the software, it loads a new page in the parent window ... or the last line of code can be replaced with a document.write('content here'); or show a hidden <div>. Any of these three can be used to tell the user to disable the software).
It works on my computer with ie6 ... let me know how it works on yours (if you have popup killer software installed).