Twitter Bootstrap carousel vertical sliding

Is it possible to implement vertical carousel sliding widh Twitter Bootstrap? In bootstrap.js I find this

  , slide: function (type, next) {
  var $active = this.$element.find('.active')
    , $next = next || $active[type]()
    , isCycling = this.interval
    , direction = type == 'next' ? 'left' : 'right'
    , fallback  = type == 'next' ? 'first' : 'last'
    , that = this

I tried to change direction to "up" and "down" but sliding not working.