Image auto scroll

I was trying to modify the .js file for scroll gallery to auto scroll the imagearea so that you dont have to click to see the next image. I added a new function :

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in initialize function I invoke this.call(); to start the periodic function every 4 sec. The image will not rotate to the next image because I think I am not passing the index variable after its being incremented back to array.each(..) function. How do I fix it? Thanks!