Debugging for IE6,7

[Mycoding]

Please tell me how to debug ExtJS 4 for IE6,7.
I tryed many different thing like DebugerBar, light furebug and so on.

I very want to know how proffesional ExtJS developers debug code for IE6,7 and other old browser.

[jay@moduscreate.com]

I use the Microsoft Script debugger + debug bar + fiddler.

[Mycoding]

Thank you.