// wrap as a jQuery plugin and pass jQuery in to our anoymous function
(function ($) {
	$.fn.cross = function (options) {
		return this.each(function (i) {
			// cache the copy of jQuery(this) - the start image
			var $$ = $(this);
			// get the target from the backgroundImage + regexp
			var target = $$.css('backgroundImage').replace(/^url|[\(\)'"]/g, '');
			// nice long chain: wrap img element in span
			$$.wrap('<span style="position: relative;"><\/span>')
				// change selector to parent - i.e. newly created span
				.parent()
				// prepend a new image inside the span
				.prepend('<img>')
				// change the selector to the newly created image
				.find(':first-child')
				// set the image to the target
				.attr('src', target);
				// the CSS styling of the start image needs to be handled
				// differently for different browsers
				if ($.browser.msie) {
					$$.css({
						'position' : 'absolute',
						'left' : 0,
						'background' : '',
						'top' : '-23px'
					});
				} else if ($.browser.mozilla) {
					$$.css({
						'position' : 'absolute',
						'left' : 0,
						'background' : '',
						'top' : this.offsetTop
					});
				} else if ($.browser.opera && $.browser.version < 9.5) {
					// Browser sniffing is bad - however opera < 9.5 has a render bug
					// so this is required to get around it we can't apply the 'top' : 0
					// separately because Mozilla strips the style set originally somehow...
					$$.css({
						'position' : 'absolute',
						'left' : 0,
						'background' : '',
						'top' : "0"
					});
				} else { // Safari
					$$.css({
						'position' : 'absolute',
						'left' : 0,
						'background' : ''
					});
				}
				// similar effect as single image technique, except using .animate
				// which will handle the fading up from the right opacity for us
				$$.hover(function () {
					$$.stop().animate({
						opacity: 0
					}, 250);
				}, function () {
					$$.stop().animate({
						opacity: 1
						}, 250);
				});
			});
		};
})(jQuery);
// note that this uses the .bind('load') on the window object, rather than $(document).ready()
// because .ready() fires before the images have loaded, but we need to fire *after* because
// our code relies on the dimensions of the images already in place.
$(window).bind('load', function () {
				$('img.fade').cross();
});