一个滚动循环图片的脚本有关问题

一个滚动循环图片的脚本问题
此脚本兼容IE6,IE9,火狐，谷歌，不支持IE7,IE8.。求大神指点到底哪里出了问题
JS

JScript code

/***glide.layerGlide((oEventCont,oSlider,sSingleSize,sec,fSpeed,point);*@param auto type:bolean 是否自动滑动 当值是true的时候 为自动滑动*@param oEventCont type:object 包含事件点击对象的容器*@param oSlider type:object 滑动对象*@param sSingleSize type:number 滑动对象里单个元素的尺寸（width或者height）  尺寸是有point 决定*@param second type:number 自动滑动的延迟时间  单位/秒*@param fSpeed type:float   速率 取值在0.05--1之间 当取值是1时  没有滑动效果*@param point type:string   left or top*/var glide = new function () {    function $id(id) { return document.getElementById(id); };    this.layerGlide = function (auto, oEventCont, oSlider, sSingleSize, second, fSpeed, point) {        var oSubLi = $id(oEventCont).getElementsByTagName('li');        var interval, timeout, oslideRange;        var time = 1;        var speed = fSpeed        var sum = oSubLi.length;        var a = 0;        var delay = second * 1000;        var setValLeft = function (s) {            return function () {                oslideRange = Math.abs(parseInt($id(oSlider).style[point]));                $id(oSlider).style[point] = -Math.floor(oslideRange + (parseInt(s * sSingleSize) - oslideRange) * speed) + 'px';                if (oslideRange == [(sSingleSize * s)]) {                    clearInterval(interval);                    a = s;                }            }        };        var setValRight = function (s) {            return function () {                oslideRange = Math.abs(parseInt($id(oSlider).style[point]));                $id(oSlider).style[point] = -Math.ceil(oslideRange + (parseInt(s * sSingleSize) - oslideRange) * speed) + 'px';                if (oslideRange == [(sSingleSize * s)]) {                    clearInterval(interval);                    a = s;                }            }        }        function autoGlide() {            for (var c = 0; c < sum; c++) { oSubLi[c].className = ''; };            clearTimeout(interval);            if (a == (parseInt(sum) - 1)) {                for (var c = 0; c < sum; c++) { oSubLi[c].className = ''; };                a = 0;                oSubLi[a].className = "active";                interval = setInterval(setValLeft(a), time);                timeout = setTimeout(autoGlide, delay);            } else {                a++;                oSubLi[a].className = "active";                interval = setInterval(setValRight(a), time);                timeout = setTimeout(autoGlide, delay);            }        }        if (auto) { timeout = setTimeout(autoGlide, delay); };        for (var i = 0; i < sum; i++) {            oSubLi[i].onmouseover = (function (i) {                return function () {                    for (var c = 0; c < sum; c++) { oSubLi[c].className = ''; };                    clearTimeout(timeout);                    clearInterval(interval);                    oSubLi[i].className = "active";                    if (Math.abs(parseInt($id(oSlider).style[point])) > [(sSingleSize * i)]) {                        interval = setInterval(setValLeft(i), time);                        this.onmouseout = function () { if (auto) { timeout = setTimeout(autoGlide, delay); }; };                    } else if (Math.abs(parseInt($id(oSlider).style[point])) < [(sSingleSize * i)]) {                        interval = setInterval(setValRight(i), time);                        this.onmouseout = function () { if (auto) { timeout = setTimeout(autoGlide, delay); }; };                    }                }            })(i)        }    }}glide.layerGlide(true, 'icon_num_top', 'show_pic_top', 237, 2, 0.1, 'top');

CSS code

#picBox{width:746px; height:234px;  overflow:hidden; position:relative;}#picBox ul#show_pic{ margin:0; padding:0; list-style:none; height:234px; width:3050px; position:absolute;}#picBox ul#show_pic li{ float:left; margin:0; padding:0; height:234px;}#picBox ul#show_pic li img{ display:block;}#icon_num{ position:absolute; bottom:0px; right:10px;}#icon_num li{ float:left; background:url(http://pc.qq.com/pc/images/flashbutton.gif) no-repeat -15px 0;width:15px; height:15px; list-style:none; color:#39F; text-align:center;  cursor:pointer; padding:0; margin:0;margin-right:5px;}#icon_num li:hover,#icon_num li.active{ background:url(http://pc.qq.com/pc/images/flashbutton.gif) no-repeat 0 0; color:#fff;}#picBox_top{width:746px; height:234px; margin:auto; position:relative; overflow:hidden;}#picBox_top ul#show_pic_top{ margin:0; padding:0; list-style:none; height:234px; width:746px; position:absolute;}#picBox_top ul#show_pic_top li{ float:left; margin:0; padding:0; height:234px;}#picBox_top ul#show_pic_top li img{ display:block;}#icon_num_top{ position:absolute; bottom:0px; right:10px;}#icon_num_top li{ float:left; background:url(http://pc.qq.com/pc/images/flashbutton.gif) no-repeat -15px 0;width:15px; height:15px; list-style:none; color:#39F; text-align:center;  cursor:pointer; padding:0; margin:0;margin-right:5px;}#icon_num_top li:hover,#icon_num_top li.active{ background:url(http://pc.qq.com/pc/images/flashbutton.gif) no-repeat 0 0; color:#fff;}