css3动画让元素绕着圆圈转动（css3动画过渡实现鼠标跟随导航效果）

<li class="wrap">
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                <li style="background-position:-2980px 0px"></li>
                <li style="background-position:-3210px 0px"></li>
            </ul>
            <li class="box"></li>

        <style>
            *{
                margin:0px;
                padding:0px;
            }
            html{
                height:100%;
            }
            body{
                width:100%;
                height:100%;
                background:url("images/wallpaper4.jpg" alt="css3动画让元素绕着圆圈转动（css3动画过渡实现鼠标跟随导航效果）" border="0" />

    <script>
            var oLi = document.getElementsByTagName("li");
            var box = document.getElementsByClassName("box")[0];
            for (var i = 0;i<oLi.length ;i++ )
            {
                oLi[i].onmousemove = function(){
                    var _left = this.offsetLeft;
                    var _top = this.offsetTop;
                    box.style.left = _left + "px";
                    box.style.top = _top + "px";
                    this.style.backgroundPositionY = "-150px";
                }
                oLi[i].onmouseout = function(){
                    this.style.backgroundPositionY = "0px";
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