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Level 2

I am JavaScript beginner; I need to add a Stopwatch (counting up) in the footer of the Master Page.   I found a few JavaScript samples online, but in my case, the stopwatch must start when the pdf is opened and stop after the close button is hit in the last page.  I am having problems calling the functions to process and populate the field.   Does any one have a working example of a stopwatch pdf or xdp?

Thanks,