$(function(){
	$("#nav li").hover(
		function(){
			if(this.timer){
				clearTimeout(this.timer);
				this.timer = 0;
			}
			var ori = $(this).find("img:first").attr("src");
			var n = ori.replace("_1", "_2");
			$(this).find("img:first").attr("ori", ori);
			$(this).find("img:first").attr("src", n);
			$(this).children("div").fadeIn(400);
		},
		function(){
			var ori = $(this).find("img:first").attr("ori");
			$(this).find("img:first").attr("src", ori);
			var self = this;
			this.timer = setTimeout(function(){
				$(self).children("div").fadeOut(400);
			}, 1000);
		}
	);
});