Shortcut icon manager

ShortcutIcon.js

jQuery.icon = (function ($) {
	var types = {
			ico: 'image/x-icon',
			gif: 'image/gif',
			png: 'image/png',
			jpg: 'image/jpeg',
			jpeg: 'image/jpeg'
		},
		_icon,
		_stack=[],
		$icon = function () {
			if (_icon) return _icon;
			_icon = $('link[rel="shortcut icon"]');
			if (_icon.length) return $icon;
			_icon = $('<link>')
				.attr('rel', 'shortcut icon')
				.appendTo('head:first');
			return _icon;
		},
		_ = {
			get: function () {
				return $icon().attr('href');
			},
			set: function (url) {
				$icon()
					.attr('href', url)
					.attr('type', url?(types[url.replace(/^.*\.(ico|gif|jpe?g|png)$/i, '$1').toLowerCase()]):'')
					.remove();
				if (url) $icon().appendTo('head:first');
			},
			push: function (url) {
				_stack.push(_.get());
				_.set(url);
			},
			pop: function () {
				if (_stack.length==0) return;
				var now = _.get(),
					top =_stack.pop();
				_.set(top);
				return now;
			}
		};
	return _;
})(jQuery);