/******************************************************
* jQuery plug-in
* Easy Background Image Resizer
* Developed by J.P. Given (http://johnpatrickgiven.com)
* Useage: anyone so long as credit is left alone
******************************************************/


(function ($) {
    // Global Var
    var jqez = null;

    // Define the plugin
    $.ezBgResize = function (obj) {

        // Set global to obj passed
        jqez = obj;

        // Create a unique div container
        $("body").append('<div id="jq_ez_bg"></div>');

        // Check for required options
        if ((jqez.width == undefined) || (jqez.height == undefined)) {
            alert('You must pass a width and height for the jQuery Easy Background Resizer to work.');
        }

        // Add the image to it.
        $("#jq_ez_bg").html('<img src="' + jqez.img + '" width="' + jqez.width + '" height="' + jqez.height + '" border="0">');

        // First position object
        $("#jq_ez_bg").css("visibility", "hidden");

        // Overflow set to hidden so scroll bars don't mess up image size.
        $("body").css({
            "overflow": "hidden"
        });

        // On window load, resize image.
        $(window).bind("load", function () {
            resizeImage();
        });

        // On window resize, resize image.
        $(window).bind("resize", function () {
            resizeImage();
        });

    };

    // Actual resize function
    function resizeImage() {

        $("#jq_ez_bg").css({
            "position": "fixed",
            "top": "0px",
            "left": "0px",
            "z-index": "-1",
            "overflow": "hidden",
            "width": $(window).width() + "px",
            "height": $(window).height() + "px",
            "opacity": jqez.opacity
        });

        // Image relative to its container
        $("#jq_ez_bg").children('img').css("position", "relative");

        // Resize the img object to the proper ratio of the window.
        var iw = $("#jq_ez_bg").children('img').width();
        var ih = $("#jq_ez_bg").children('img').height();

        if ($(window).width() > $(window).height()) {
            //console.log(iw, ih);
            if (iw > ih) {
                var fRatio = iw / ih;
                $("#jq_ez_bg").children('img').css("width", $(window).width() + "px");
                $("#jq_ez_bg").children('img').css("height", Math.round($(window).width() * (1 / fRatio)));

                var newIh = Math.round($(window).width() * (1 / fRatio));

                if (newIh < $(window).height()) {
                    var fRatio = ih / iw;
                    $("#jq_ez_bg").children('img').css("height", $(window).height());
                    $("#jq_ez_bg").children('img').css("width", Math.round($(window).height() * (1 / fRatio)));
                }
            } else {
                var fRatio = ih / iw;
                $("#jq_ez_bg").children('img').css("height", $(window).height());
                $("#jq_ez_bg").children('img').css("width", Math.round($(window).height() * (1 / fRatio)));
            }
        } else {
            var fRatio = ih / iw;
            $("#jq_ez_bg").children('img').css("height", $(window).height());
            $("#jq_ez_bg").children('img').css("width", Math.round($(window).height() * (1 / fRatio)));
        }

        // Center the image
        if (jqez.center) {
            if ($("#jq_ez_bg").children('img').width() > $(window).width()) {
                var this_left = ($("#jq_ez_bg").children('img').width() - $(window).width()) / 2;
                $("#jq_ez_bg").children('img').css({
                    "top": 0,
                    "left": -this_left
                });
            }
            if ($("#jq_ez_bg").children('img').height() > $(window).height()) {
                var this_height = ($("#jq_ez_bg").children('img').height() - $(window).height()) / 2;
                $("#jq_ez_bg").children('img').css({
                    "left": 0,
                    "top": -this_height
                });
            }
        }

        $("#jq_ez_bg").css({
            "visibility": "visible"
        });

        // Allow scrolling again
        $("body").css({
            "overflow": "auto"
        });


    }
})(jQuery);