give the gift of flatulence

autofart.js

// use this on any page with fartscroll -> http://theonion.github.io/fartscroll.js/
setInterval((function() {
    var rangeUpper = 100;
     $("body").fartscroll(100);
    return function() {
        var randomnumber = Math.floor( Math.random() * rangeUpper ),
            mod = 1;
        if( $(document).height() - $(window).scrollTop() - $(window).height() <= 0 ) { 
            mod = -1; 
        }
        $(window).scrollTop( $(window).scrollTop() + (randomnumber * mod) );
    };
})(), 250);