window.onload = function(){

var index = 0;

var times = null

var main = document.getElementById("Main");

var center = document.getElementById("Center");

var print = center.getElementsByTagName("div");

var len = print.length;

var list = document.getElementById("Nav").getElementsByTagName("div");

function method(){

// 鼠标滑过图片禁止，鼠标离开进行轮播

main.onmouseover = function(){

// 鼠标滑过图片禁止

if(times) clearInterval(times);

}

main.onmouseout = function(){

// 鼠标离开进行轮播

times = setInterval(function(){

index++;

if(index >= len){

index = 0;

}

imgimage();

},1000);

}

main.onmouseout();

// 当点击导航时图片切换

for (var i=0; i<len;i++){

list[i].id = i;

list[i].onclick = function(){

index = this.id;

imgimage();

}

}

}

    // 切换图片

    function imgimage(){

    for (var i=0; i<len; i++){

    print[i].style.display = "none";

    list[i].className = "";

    }

    print[index].style.display = "block";

    list[index].className = "list";

    }

    method();

}