/*
Supersized - Full Screen Background/Slideshow jQuery Plugin
supersized.1.0.js
February 2009
By Sam Dunn
www.buildinternet.com / www.onemightyroar.com
*/
(function($) {

    //Resize image on ready or resize
    $.fn.supersized = function() {

        var options = $.extend($.fn.supersized.defaults, $.fn.supersized.options);

        if (options.slideshow == 1) {
            setInterval("theslideshow()", options.slideinterval);
        }

        $().ready(function() {
            $('#supersize').resizenow();
        });
        $(window).bind("resize", function() {
            $('#supersize').resizenow();
        });
    };

    //Adjust image size
    $.fn.resizenow = function() {

        var options = $.extend($.fn.supersized.defaults, $.fn.supersized.options);

        return this.each(function() {

            //Define image ratio & minimum dimensions
            var minwidth = options.minsize * (options.startwidth);
            var minheight = options.minsize * (options.startheight);
            var ratio = options.startheight / options.startwidth;

            //Gather browser and current image size
            var imagewidth = $(this).width();
            var imageheight = $(this).height();
            var browserwidth = $(window).width();
            var browserheight = $(window).height();

            //Check for minimum dimensions
            if ((browserheight < minheight) && (browserwidth < minwidth)) {
                $(this).height(minheight);
                $(this).width(minwidth);
            }
            else {
                //When browser is taller	
                if (browserheight > browserwidth) {
                    imageheight = browserheight;
                    $(this).height(browserheight);
                    imagewidth = browserheight / ratio;
                    $(this).width(imagewidth);

                    if (browserwidth > imagewidth) {
                        imagewidth = browserwidth;
                        $(this).width(browserwidth);
                        imageheight = browserwidth * ratio;
                        $(this).height(imageheight);
                    }

                }

                //When browser is wider
                if (browserwidth >= browserheight) {
                    imagewidth = browserwidth;
                    $(this).width(browserwidth);
                    imageheight = browserwidth * ratio;
                    $(this).height(imageheight);

                    if (browserheight > imageheight) {
                        imageheight = browserheight;
                        $(this).height(browserheight);
                        imagewidth = browserheight / ratio;
                        $(this).width(imagewidth);
                    }
                }
            }
            return false;
        });
    };

    $.fn.supersized.defaults = {
        startwidth: 640,
        startheight: 480,
        minsize: .5,
        slideshow: 1,
        slideinterval: 5000
    };

})(jQuery);

//Slideshow Add-on
function theslideshow() {

    var currentslide = $('#supersize .activeslide');

    if (currentslide.length == 0) currentslide = $('#supersize :last');

    var nextslide = currentslide.next().length ? currentslide.next() : $('#supersize :first');

    nextslide.addClass('activeslide');
    currentslide.removeClass('activeslide');

}