var Nav = {
    _pages: [],
    newPage: function(pageInfo) {
        var close = pageInfo.close
        var page = pageInfo.page

        $('#' + page).fadeIn('fast')
        $('#' + close).on('click', {
            page: page
        }, function(event) {
            var p = event.data.page
            $('#' + p).fadeOut('fast')
            Nav._pages.splice(Nav._pages.length - 1, 1)
        })

        if (this._pages.length > 0) {
            var lastPage = this._pages[this._pages.length - 1].page
            $('#' + lastPage).fadeOut('fast')

            $('#' + close).off('click')
            $('#' + close).on('click', {
                page: page,
                lastPage: lastPage
            }, function(event) {
                var p = event.data.page
                var lp = event.data.lastPage
                $('#' + p).fadeOut('fast')
                $('#' + lp).fadeIn('fast')

                Nav._pages.splice(Nav._pages.length - 1, 1)
            })
        }
        this._pages.push(pageInfo)
    }
}