/******************************************************
    * 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("visibility","hidden");

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

      resizeImage();
    })
    
    .each(function(){
    
     if(this.complete || (jQuery.browser.msie && parseInt(jQuery.browser.version) == 6))
    
     $(this).trigger("load");
    
     });
    
    };

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

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