       classifier.el.find(".asteroid-frame-#{frameNum}").addClass 'current-asteroid-frame'
 
   setAsteroidFrame: (frameNum) ->
-    if frameNum < @numFrames - 1
-      @nextFrame.show()
-    else
-      @nextFrame.hide()
     @el.find("#frame-slider").val frameNum
     @el.find(".asteroid-visibility-#{frameNum}").show()
 


  onClickNextFrame: ->
    nextFrame = +(document.getElementById('frame-slider').value) + 1
    @activateFrame(nextFrame) unless nextFrame is @numFrames

  onClickCancel: ->
    @resetMarkingSurfaces() if @state is 'asteroidTool' or 'artifactTool'

        @el.find('.asteroid-classifier').hide()
        @doneButton.hide()
        @finishButton.show()
        @onClickFlicker() unless @el.attr('flicker') is 'true'

    artifactTool:
      enter: ->
