var banner_index = 0;
domReady(function () {
	
	var banner = document.getElementById("index_banner").getElementsByTagName("a");
	for(i=1;i<banner.length;i++){
		banner[i].style.display = "none";
	}
	window.setInterval(index_banner_autoPlay,5000);
});
function index_banner_autoPlay(){
	var banner = document.getElementById("index_banner").getElementsByTagName("a");
	var len = banner.length;
	banner[banner_index].style.display = "none";
	banner_index+=1;
	if(banner_index == len) banner_index = 0;
	banner[banner_index].style.display = "block";
	
}