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(function($) {
	var fadeInSpeed  = 600;
	var fadeOutSpeed = 200;

	$('.rollover').each(function() {
		this.onImage = $(this).attr('src').replace(/^(.+)(\.[a-z]+)$/,"$1"+'_o'+"$2");
		this.onHtml = $('<img src="'+this.onImage+'" alt="" style="position: absolute; opacity: 0;" />');
		$(this).before(this.onHtml);

		$(this).hover(
			function(){
				$(this).stop().animate({'opacity': 0}, fadeInSpeed);
				$(this).prev().stop().animate({'opacity': 1}, fadeInSpeed);
			},
			function(){
				$(this).stop().animate({'opacity': 1}, fadeOutSpeed);
				$(this).prev().animate({'opacity': 0}, fadeOutSpeed);
			}
		);
	});
})(jQuery);