Cross browser JavaScript (not jQuery…) scroll to top animation

Question

I\'m looking for a simple, cross-browser \"scroll to top\" animation I can apply to a link. I don\'t want to require a JS library such as jQuery/Moo, etc.

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Answer 1

Easy.

var scrollIt = function(time) {
    // time = scroll time in ms
    var start = new Date().getTime(),
        scroll = document.documentElement.scrollTop + document.body.scrollTop,
        timer = setInterval(function() {
            var now = Math.min(time,(new Date().getTime())-start)/time;
            document.documentElement.scrollTop
                = document.body.scrollTop = (1-time)/start*scroll;
            if( now == 1) clearTimeout(timer);
        },25);
}