$(document).ready(function(){
		var adArr = [ "/images/page/index/ad/ad01.jpg",
					  "/images/page/index/ad/ad02.jpg",
					  "/images/page/index/ad/ad03.jpg",
					  "/images/page/index/ad/ad04.jpg"
					  ];
		var cur = 0;
		function showAd(){
			cur ++;
			if(cur == adArr.length){
				cur = 0;
			}
			$("#header .adSec img").attr("src",adArr[cur]);	
		}
		setInterval(showAd,5000);		   
})