How do I create a function that scrolls up the page bit-by-bit, using JQuery?

How do I create a function like this that scrolls up the page bit-by-bit? $('#down').click(function(){ $('html, body').animate({ scrollTop: $(this).offset().top += 20 }); return false; }); This function works for scrolling down the page...I've a play trying to get it to scroll up the page but no success. Any help is much appreciated, Thanks
so you want to say that -=20 doesnt work ?

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