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/**

* jQuery.Preload

* https://github.com/htmlhero/jQuery.preload

* Created by Andrew Motoshin

* http://htmlhero.ru

* Version: 1.5.0

* Requires: jQuery 1.6+

(function($){

$.preload = (function(sources, part, callback){

// Plugin cache

var cache = [];

// Wrapper for cache

var caching = function(image){

for (var i = 0; i < cache.length; i++) {

if (cache[i].src === image.src) {

return cache[i];

}

cache.push(image);

return image;

};

// Execute callback

var exec = function(sources, callback, last){

if (typeof callback === 'function') {

callback.call(sources, last);

}

};

// Closure to hide cache

return function(sources, part, callback){

// Check input data

if (typeof sources === 'undefined') {

return;

}

if (typeof sources === 'string') {

sources = [sources];

}

if (arguments.length === 2 && typeof part === 'function') {

callback = part;

part = 0;

}

// Split to pieces

var total = sources.length,

next;

if (part > 0 && part < total) {

next = sources.slice(part, total);

sources = sources.slice(0, part);

total = sources.length;

}

// If sources array is empty

if (!total) {

exec(sources, callback, true);

return;

}

// Image loading callback

var preload = arguments.callee,

count = 0;

var loaded = function(){

count++;

if (count !== total) {

return;

}

exec(sources, callback, !next);

preload(next, part, callback);

};

// Loop sources to preload

var image;

for (var i = 0; i < sources.length; i++) {

image = new Image();

image.src = sources[i];

image = caching(image);

if (image.complete) {

loaded();

} else {

$(image).on('load error', loaded);

}

};

})();

// Get URLs from DOM elements

var getSources = function(items, options){

var sources = [],

reg = new RegExp('url\$[\'"]?([^"\'$]*)[\'"]?\\)', 'i'),

$this, imageList, image, url, i;

if (options.recursive) {

items = items.find('*').add(items);

}

items.each(function(){

$this = $(this);

imageList = $this.css('background-image') + ',' + $this.css('border-image-source');

imageList = imageList.split(',');

for (i = 0; i < imageList.length; i++) {

image = imageList[i];

if (image.indexOf('about:blank') !== -1 ||

image.indexOf('data:image') !== -1) {

continue;

}

url = reg.exec(image);

if (url) {

sources.push(url[1]);

}

if (this.nodeName === 'IMG') {

sources.push(this.src);

}

});

return sources;

};

$.fn.preload = function(){

var options, callback;

// Make arguments flexible

if (arguments.length === 1) {

if (typeof arguments[0] === 'object') {

options = arguments[0];

} else {

callback = arguments[0];

}

} else if (arguments.length > 1) {

options = arguments[0];

callback = arguments[1];

}

// Extend default options

options = $.extend({

recursive: true,

part: 0

}, options);

var items = this,

sources = getSources(items, options);

$.preload(sources, options.part, function(last){

if (last && typeof callback === 'function') {

callback.call(items.get());

}

});

return this;

};

})(jQuery);