Debugging Javascript in IE

When a javascript error comes up - it normally gives some basic information, like what line the error occured. It's usually not enough to debug it.

You can add a script debugger that will be considerably more helpful. To do this, do these two things...

1) Don't disable script debugging -> IE/Tools/Internet Options/Advanced
2) Get the debugger

Here's some more info about the script debugger from Jonathan Boutelle