jquery scroll to top convert to scroll to bottom

I copied this code from the internet and wanted the get a identical result, however I want it to scroll down insted. I have tried to convert it as best I could, but I could not get it to work your help will be greatly appreciated.


    // hide #back-top first

    // fade in #back-top
    $(function () {
        $(window).scroll(function () {
            if ($(this).scrollTop() > 100) {
            } else {

        // scroll body to 0px on click
        $('#back-top a').click(function () {
                scrollTop: 0
            }, 800);
            return false;



$('#go-down').click(function () {
   $("html, body").animate({ scrollTop: $(document).height() }, "slow");
        return false;

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