gistfile1.coffee

## jQuery extension that tracks the current scroll depth

$.fn.extend
  scrolltracker: (step) ->
    maxDepth = 0
    this.scroll ->
      depth = Math.floor($(this).scrollTop() / step)
      if depth > maxDepth
        maxDepth = depth
        _gaq.push(['_trackEvent', 'ScrollDepth', depth * step]);