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It does take the page up half of the time- but rarely to the top of the page. I tried in on many pages and it only worked sometimes on singular pages that did not connect to other pages. Fix it and I will boost my review.
A nice script, something i thought would of already been available considering you press space to scroll to bottom of page. Just makes things that little bit more simpler. Hit space again and your back to top. Very simple and effective. Great idea.