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  ko.bindingHandlers.fadeVisible =
    init: (element, valueAccessor) ->
      value = valueAccessor()
      $(element).toggle ko.utils.unwrapObservable(value)
    update: (element, valueAccessor) ->
      value = valueAccessor()
      (if ko.utils.unwrapObservable(value) then $(element).fadeIn(1000) else $(element).fadeOut(1000))