/******************************************************

    * 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 Namespace

    var jqez = {};



    // Define the plugin

    $.fn.ezBgResize = function(options) {

		

		// Set global to obj passed

		jqez = options;

		

		// If img option is string convert to array.

		// This is in preparation for accepting an slideshow of images.

		if (!$.isArray(jqez.img)) {

			var tmp_img = jqez.img;

			jqez.img = [tmp_img]

		}

		

		$("<img/>").attr("src", jqez.img).load(function() {

			jqez.width = this.width;

			jqez.height = this.height;

			

			// Create a unique div container

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



			// Add the image to it.

			$("#jq_ez_bg").html('<img src="' + jqez.img[0] + '" width="' + jqez.width + '" height="' + jqez.height + '" border="0">');



			// First position object

	        $("#jq_ez_bg").css("display","none");



			// Overflow set to hidden so scroll bars don't mess up image size.

	        $("body").css({

	            "overflow":"hidden"

	        });



			resizeImage();

		});

    };



	$(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 (typeof(jqez.center) == 'undefined' || 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").fadeIn(0);



		// Allow scrolling again

		$("body").css({

            "overflow":"auto"

        });

		

        

    }

})(jQuery);