== Navigation popups error: op or cl is null! something is wrong == 

 I am using IE 6.0.28 and I keep getting a Windows pop-up dialog box that says "Navigation popups error: op or cl is null! something is wrong".  If I click "OK", then the box goes away and I can click on the link.  The Lupin popup still shows but the pop-up dialog is totally annoying. 

 At this point, I'd be find getting rid of Lupin popups completely but I can't figure out how to do that.  I tried removing everything from my monobook.js but that didn't seem to help.   

 Don't get me wrong.  I love Lupin popups and the prospect of not being able to use them is not a happy one.  However, this "navigation popups error" is driving me nuts and I'd rather get rid of Lupin popups than have to live with it any longer. 

 HELP!