$(function(){
	$(".top_link a img,#alpha a img").hover(
		function(){
			filename = $(this).attr("src");
			if($(this).attr("class") != "non_over"){
				var filename_a = filename.split("/");
				i = parseFloat(filename_a.length) - 1;
				l = i - 2;
				filename_b = filename_a[i].split(".");
				over_name = filename_b[0] + "_on." + filename_b[1];
				delete filename_a[i];
				$(this).attr("src",filename_a.join("/") + over_name);
			}
		},function(){
			$(this).attr("src",filename);
		}
	);
});