I got the bugs nailed down. Firebug helped a lot in the process. I could never imagine how hard it would be without Firebug. If you are serious Javascript programmer, you should really learn to use this.

Two tabs which are most useful to me were the console and the script tabs. The console tab lets you see in real time the flow of the program. Which function/method is being called. What error message is output. Etc.

The script tag lets you define break point and inspect the value of the variables.