Function scrollify

jquery.scrollify.js:208–721

(options)

    }
  }
  var scrollify = function(options) {
    initialised = true;
    $.easing['easeOutExpo'] = function(x, t, b, c, d) {
      return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
    };

    manualScroll = {
      handleMousedown:function() {
        if(disabled===true) {
          return true;
        }
        scrollable = false;
        scrolled = false;
      },
      handleMouseup:function() {
        if(disabled===true) {
          return true;
        }
        scrollable = true;
        if(scrolled) {
          //instant,callbacks
          manualScroll.calculateNearest(false,true);
        }
      },
      handleScroll:function() {
        if(disabled===true) {
          return true;
        }
        if(timeoutId){
          clearTimeout(timeoutId);
        }

        timeoutId = setTimeout(function(){
          scrolled = true;
          if(scrollable===false) {
            return false;
          }
          scrollable = false;
          //instant,callbacks
          manualScroll.calculateNearest(false,true);
        }, 200);
      },
      calculateNearest:function(instant,callbacks) {
        top = $(settings.target).scrollTop();
        var i =1,
          max = heights.length,
          closest = 0,
          prev = Math.abs(heights[0] - top),
          diff;
        for(;i<max;i++) {
          diff = Math.abs(heights[i] - top);

          if(diff < prev) {
            prev = diff;
            closest = i;
          }
        }
        if((atBottom() && closest>index) || atTop()) {