How have you implemented the button you name invisClick?
I really don't understand the question, I was watching tutorial on Lynda.com and the lady named her ActionScript invisclick. The reason for it is to make the entire picture in my banner clickable.
In the first line of code that you show you target something called invisClick. That needs to be the name of a movieclip or button that you placed on the stage and assigned that name to via the Properties panel. If you did not do that, then that is where your problem stems from.