$(function(){
	$('[src*="_s1."]').mouseover(function(){
			$(this).attr("src",$(this).attr("src").replace(/^(.+)_s1(\.[a-z]+)$/,"$1_s2$2"));
		})
		.mouseout(function(){
			$(this).attr("src",$(this).attr("src").replace(/^(.+)_s2(\.[a-z]+)$/,"$1_s1$2"));
		})
		.each(function(init){
			$("<img>").attr("src",$(this).attr("src").replace(/^(.+)_s1(\.[a-z]+)$/,"$1_s2$2"));
		}
	)
});