This morning my JavaScript was causing an error in IE 6. The error was : “ERROR: ‘isFormField’ is null or not an object” which makes sense only to one guy at Microsoft who also happens to have collection Sub-Saharan lizards.

I got a hint that it might be a trailing comma somewhere in my JavaScript I stated pasting my code into jslint.com and was surprised at what a useful tool this is. Not only did it help me find my trailing comma, it showed me some other cool fixes I could do to my code.