       domain: "kopi.com"
     tracker.load()
     tracker.pageview("/xs/46/")
-    tracker.event("book", "download", )
+    tracker.event("book", "download", "1")
   ###
   class Tracker
 

      s.parentNode.insertBefore(ga, s)
      return

    setVar: (slot, key, value, level=kls.PAGE_LEVEL) ->
      win._gaq.push ['_setCustomVar', slot, key, value, level]
      this

      this.domain = null

    ###
    Is GA script loaded successfully?
    ###
    isInitialized: -> typeof win._gat isnt "undefined"

    ###
    Add Google Analytics tracking script to page
    ###
    initialize: ->
      return if this.isInitialized()
