There isnt too many shortcuts to getting to know js. One of the things
that will ease the journey though is getting to know firebug or Chrome
development tools. These allow you to set breakpoints, step through code
and examine variables as you go. I would strongly suggest you step
through the code in firebug. You error message implies you have a
variable which you think is a layer, but is in fact null. Could be as
simple as a spelling mistake or incorrect case.
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