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

var containerObj;

(function($) {
// plugin definition
$.fn.ezBgResize = function(options) {
// First position object
containerObj = this;

containerObj.css("visibility","hidden");

$(window).load(function() {
resizeImage();
});

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

};

function resizeImage() {

containerObj.css({
"position":"fixed",
"top":"0px",
"left":"0px",
"z-index":"-1",
"overflow":"hidden",
"width":getWindowWidth() + "px",
"height":getWindowHeight() + "px"
});

// Resize the img object to the proper ratio of the window.
var iw = containerObj.children('img').width();
var ih = containerObj.children('img').height();
if (getWindowWidth() > getWindowHeight()) {
if (iw > ih) {
var fRatio = iw/ih;
containerObj.children('img').css("width",getWindowWidth() + "px");
containerObj.children('img').css("height",Math.round(getWindowWidth() * (1/fRatio)));

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

if(newIh < getWindowHeight()) {
var fRatio = ih/iw;
containerObj.children('img').css("height",getWindowHeight());
containerObj.children('img').css("width",Math.round(getWindowHeight() * (1/fRatio)));
}
} else {
var fRatio = ih/iw;
containerObj.children('img').css("height",getWindowHeight());
containerObj.children('img').css("width",Math.round(getWindowHeight() * (1/fRatio)));
}
} else {
var fRatio = ih/iw;
containerObj.children('img').css("height",getWindowHeight());
containerObj.children('img').css("width",Math.round(getWindowHeight() * (1/fRatio)));
}
containerObj.css("visibility","visible");
}

// private function for debugging
function debug($obj) {
if (window.console && window.console.log) {
window.console.log('Window Width: ' + $(window).width());
window.console.log('Window Height: ' + $(window).height());
}
};

// Dependable function to get Window Height
function getWindowHeight() {
var windowHeight = 0;
if (typeof(window.innerHeight) == 'number') {
windowHeight = window.innerHeight;
}
else {
if (document.documentElement && document.documentElement.clientHeight) {
windowHeight = document.documentElement.clientHeight;
}
else {
if (document.body && document.body.clientHeight) {
windowHeight = document.body.clientHeight;
}
}
}
return windowHeight;
};

// Dependable function to get Window Width
function getWindowWidth() {
var windowWidth = 0;
if (typeof(window.innerWidth) == 'number') {
windowWidth = window.innerWidth;
}
else {
if (document.documentElement && document.documentElement.clientWidth) {
windowWidth = document.documentElement.clientWidth;
}
else {
if (document.body && document.body.clientWidth) {
windowWidth = document.body.clientWidth;
}
}
}
return windowWidth;
};
})(jQuery);

$(document).ready(function() {
    $("#body-background").ezBgResize();
});