Changing the scrollTop value changes where you wants the scrollbar to land. All you're really doing is animating the body of the document throughout the course of 800 milliseconds until it scrolls to the top of the document.
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AllThingsSmitty/jquery-tips-everyone-should-know
Changing the scrollTop value changes where you wants the scrollbar to land. All you're really doing is animating the body of the document throughout the course of 800 milliseconds until it scrolls to the top of the document.
Full article