I love it! Now I can much more easily debug JS behaviour in those benighted browsers (such as Internet Exploder) that don't have (or don't have decent) JS consoles. Woohoo!

I've got good news, and I've got bad news:
The universe is merely a figment of my imagination.
Now are you ready for the bad news?

I sugest using window.dwin instead of dwin and using onuload event in debug window to reset opener.dwin to null in case of closing debug window.

can't you just type debugger; in your code and it breaks at that point?

alerts aren't the recommended debug method for JS