$(function(){
 var nowIndex = 0;
 var imgList = $('.banner_list ul li');
 var aBtn = $('.banner_but ul li');

 imgList.hide().eq(nowIndex).fadeIn('slow');
 aBtn.eq(nowIndex).addClass('banner_cur');

 function hideShow(){
	imgList.eq(nowIndex).fadeIn('slow').siblings().fadeOut('slow');
	aBtn.eq(nowIndex).addClass('banner_cur').siblings().removeClass('banner_cur');
}
function next(){
	if(nowIndex > imgList.length -1)
	{ nowIndex =0;}
	else if( nowIndex < 0){ nowIndex = imgList.length -1;} 
	hideShow();
}
function autoPlay(){
	nowIndex++;
	next();
}
 var timer = setInterval(autoPlay,5000);
aBtn.hover(function(){
	clearInterval(timer);
	nowIndex = $(this).index();
	hideShow();
	timer = setInterval(autoPlay,8000);
	return false;
})
})