Javascript Progress Bar

I found this great tutorial for a JavaScript progress bar. It looks and works great! (If you try it, make sure to preview the html5 output)

https://clearningau.wordpress.com/2014/03/26/creating-a-dynamic-progress-bar-in-storyline/

However, it only tracks the slide count in individual scenes rather than the entire project. Anyone know JavaScript well enough to be able to alter the script to get the total number of slides from all of the scenes?

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