/******************************************************
* 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() {

        var ezWidth = $(window).width();
        var ezHeight = $(window).height();

        var imgWidth = jqez.width;
        var imgHeight = jqez.height;

        if( ezWidth < imgWidth ){

            ezWidth = imgWidth;
            ezHeight = imgHeight;
        }

        $("#jq_ez_bg").css({
            "position":"absolute",
            "top":"0px",
            "left":"0px",
            "z-index":"-1",
            "overflow":"hidden",
            "width":ezWidth + "px",
            "height":ezHeight + "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 (ezWidth > ezHeight) {
            //console.log(iw, ih);
            if (iw > ih) {
                var fRatio = iw/ih;
                $("#jq_ez_bg").children('img').css("width",ezWidth + "px");
                $("#jq_ez_bg").children('img').css("height",Math.round(ezWidth * (1/fRatio)));

                var newIh = Math.round(ezWidth * (1/fRatio));

                if(newIh < ezHeight) {
                    var fRatio = ih/iw;
                    $("#jq_ez_bg").children('img').css("height",ezHeight);
                    $("#jq_ez_bg").children('img').css("width",Math.round(ezHeight * (1/fRatio)));
                }
            } else {
                var fRatio = ih/iw;
                $("#jq_ez_bg").children('img').css("height",ezHeight);
                $("#jq_ez_bg").children('img').css("width",Math.round(ezHeight * (1/fRatio)));
            }
        } else {
            var fRatio = ih/iw;
            $("#jq_ez_bg").children('img').css("height",ezHeight);
            $("#jq_ez_bg").children('img').css("width",Math.round(ezHeight * (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" : 0
});
}
}

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

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

        
    }
})(jQuery);