(function ($) {
    $.gmbox = function (data) {
        $.gmbox.init()
        $.gmbox.loading()
        $.isFunction(data) ? data.call() : $.gmbox.reveal(data)
    }

    $.gmbox.settings = {
        loading_image: 'images/loading.gif',
        close_image: 'images/closelabel.gif',
        image_types: ['png', 'jpg', 'jpeg', 'gif'],
        gmbox_html: '\
  <div id="gmbox" style="display:none;"> \
    <div class="popup"> \
      <table> \
        <tbody> \
          <tr> \
            <td class="tl"/><td class="b"/><td class="tr"/> \
          </tr> \
          <tr> \
            <td class="b"/> \
            <td class="body"> \
              <div class="content"> \
              </div> \
              <div class="footer"> \
                <a href="#" class="close"> \
                  <img src="" title="close" class="close_image" /> \
                </a> \
              </div> \
            </td> \
            <td class="b"/> \
          </tr> \
          <tr> \
            <td class="bl"/><td class="b"/><td class="br"/> \
          </tr> \
        </tbody> \
      </table> \
    </div> \
  </div>'
    }

    $.gmbox.loading = function () {
        if ($('#gmbox .loading').length == 1) return true

        $('#gmbox .content').empty()
        $('#gmbox .body').children().hide().end().
      append('<div class="loading"><img src="' + $.gmbox.settings.loading_image + '"/></div>')

        var pageScroll = $.gmbox.getPageScroll()
        $('#gmbox').css({
            top: pageScroll[1] + ($.gmbox.getPageHeight() / 10),
            left: pageScroll[0]
        }).show()

        $(document).bind('keydown.gmbox', function (e) {
            if (e.keyCode == 27) $.gmbox.close()
        })
    }

    $.gmbox.reveal = function (data, klass) {
        if (klass) $('#gmbox .content').addClass(klass)
        $('#gmbox .content').append(data)
        $('#gmbox .loading').remove()
        $('#gmbox .body').children().fadeIn('normal')
    }

    $.gmbox.close = function () {
        $(document).unbind('keydown.gmbox')
        $('#gmbox').fadeOut(function () {
            $('#gmbox .content').removeClass().addClass('content')
        })
        return false
    }

    $.fn.gmbox = function () {
        $.gmbox.init()

        var image_types = $.gmbox.settings.image_types.join('|')
        image_types = new RegExp('\.' + image_types + '$', 'i')

        function click_handler() {
            $.gmbox.loading(true)

            // support for rel="gmbox[.inline_popup]" syntax, to add a class
            var klass = this.rel.match(/gmbox\[\.(\w+)\]/)
            if (klass) klass = klass[1]

            // div
            if (this.href.match(/#/)) {
                var url = window.location.href.split('#')[0]
                var target = this.href.replace(url, '')
                $.gmbox.reveal($(target).clone().show(), klass)

                // image
            } else if (this.href.match(image_types)) {
                var image = new Image()
                image.onload = function () {
                    $.gmbox.reveal('<div class="image"><img src="' + image.src + '" /></div>', klass)
                }
                image.src = this.href

                // ajax
            } else {
                $.get(this.href, function (data) { $.gmbox.reveal(data, klass) })
            }

            return false
        }

        this.click(click_handler)
        return this
    }

    $.gmbox.init = function () {
        if ($.gmbox.settings.inited) {
            return true
        } else {
            $.gmbox.settings.inited = true
        }

        $('body').append($.gmbox.settings.gmbox_html)

        var preload = [new Image(), new Image()]
        preload[0].src = $.gmbox.settings.close_image
        preload[1].src = $.gmbox.settings.loading_image

        $('#gmbox').find('.b:first, .bl, .br, .tl, .tr').each(function () {
            preload.push(new Image())
            preload.slice(-1).src = $(this).css('background-image').replace(/url\((.+)\)/, '$1')
        })

        $('#gmbox .close').click($.gmbox.close)
        $('#gmbox .close_image').attr('src', $.gmbox.settings.close_image)
    }

    // getPageScroll() by quirksmode.com
    $.gmbox.getPageScroll = function () {
        var xScroll, yScroll;
        if (self.pageYOffset) {
            yScroll = self.pageYOffset;
            xScroll = self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
            yScroll = document.documentElement.scrollTop;
            xScroll = document.documentElement.scrollLeft;
        } else if (document.body) {// all other Explorers
            yScroll = document.body.scrollTop;
            xScroll = document.body.scrollLeft;
        }
        return new Array(xScroll, yScroll)
    }

    // adapter from getPageSize() by quirksmode.com
    $.gmbox.getPageHeight = function () {
        var windowHeight
        if (self.innerHeight) {	// all except Explorer
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) { // other Explorers
            windowHeight = document.body.clientHeight;
        }
        return windowHeight
    }
})(jQuery);