//	http://binarykitten.me.uk/dev/jq-plugins/107-jquery-image-preloader-plus-callbacks.html
/* jQuery.preloader - v0.95 - K Reeve aka BinaryKitten
*
* v0.95
* 	# Note - keeping below v1 as really not sure that I consider it public usable.
* 	# But it saying that it does the job it was intended to do.
* 	Added Completion of loading callback.
* 	Main Reworking With Thanks to Remy Sharp of jQuery for Designers
*/

(function($) {
	$.preLoadImages = function(imageList, callback) {
		var pic = [], i, total, loaded = 0;
		if (typeof imageList != 'undefined') {
			if ($.isArray(imageList)) {
				total = imageList.length; // used later
				for (i = 0; i < total; i++) {
					pic[i] = new Image();
					pic[i].onload = function() {
						loaded++; // should never hit a race condition due to JS's non-threaded nature
						if (loaded == total) {
							if ($.isFunction(callback)) {
								callback();
							}
						}
					};
					pic[i].src = imageList[i];
				}
			}
			else {
				pic[0] = new Image();
				pic[0].onload = function() {
					if ($.isFunction(callback)) {
						callback();
					}
				}
				pic[0].src = imageList;
			}
		}
		pic = undefined;
	};

	$.preLoadCSSImages = function(callback) {
		var pic = [], i, imageList = [], loaded = 0, total, regex = new RegExp("url\((.*)\)", 'i'), spl;
		var cssSheets = document.styleSheets, path, myRules, Rule, match, txt, img, sheetIdx, ruleIdx;
		for (sheetIdx = 0; sheetIdx < cssSheets.length; sheetIdx++) {
			var sheet = cssSheets[sheetIdx];
			if (typeof sheet.href == 'string' && sheet.href.length > 0) {
				spl = sheet.href.split('/'); spl.pop(); path = spl.join('/') + '/';
			}
			else {
				path = './';
			}
			myRules = sheet.cssRules ? sheet.cssRules : sheet.rules;
			for (ruleIdx = 0; ruleIdx < myRules.length; ruleIdx++) {
				Rule = myRules[ruleIdx];
				txt = Rule.cssText ? Rule.cssText : Rule.style.cssText;
				match = regex.exec(txt);
				if (match != null) {
					img = match[1].substring(1, match[1].indexOf(')', 1));
					if (img.substring(0, 4) == 'http') {
						imageList[imageList.length] = img;
					}
					else if (match[1].substring(1, 2) == '/') {
						var p2 = path.split('/'); p2.pop(); p2.pop(); p2x = p2.join("/");
						imageList[imageList.length] = p2x + img;
					}
					else {
						imageList[imageList.length] = path + img;
					}
				}
			};
		};

		total = imageList.length; // used later
		for (i = 0; i < total; i++) {
			pic[i] = new Image();
			pic[i].onload = function() {
				loaded++; // should never hit a race condition due to JS's non-threaded nature
				if (loaded == total) {
					if ($.isFunction(callback)) {
						callback();
					}
				}
			};
			pic[i].src = imageList[i];
		}

	};
	$.preLoadAllImages = function(imageList, callback) {
		if (typeof imageList != 'undefined') {
			if ($.isFunction(imageList)) {
				callback = imageList;
			}
			else if (!$.isArray(imageList)) {
				imageList = [imageList];
			}
		}
		$.preLoadCSSImages(function() {
			if (imageList.length > 0) {
				$.preLoadImages(imageList, function() {
					callback();
				});
			}
			else {
				callback();
			}
		});
	}
})(jQuery);