简单的js幻灯片效果问题

Question

我是js新手，模仿别人做了个幻灯片效果，但奇怪的是：我在本地浏览器上，IE firefox和chrome 可以正常切换；而传到网上就奇怪了，firefox和chrome可以正常切换，在IE上却不能正常切换了。请高手看看这是什么问题，是代码的问题吗？还是...    
全部代码如下：
html:
<div class="move_box">
                        <div id="number_box">
                                <div class="number_list">
                                        <ul>
                                                <li class="show">1</li>
                                                <li>2</li>
                                        </ul>
                                </div>
                        </div>
                        <div id="img_box">
                                <div>
                                    <dl>
                                                <dt><a href="#"><img src="report1st.jpg" /></a></dt>
                                                <dd></dd>
                                        </dl>
                                        <dl>
                                                <dt><a href="#"><img src="firstnews.gif" /></a></dt>
                                                <dd></dd>
                                        </dl>
                                </div>
                        </div>
css:
.move_box{
width:650px;
height:180px;
position:relative;
overflow:hidden;
}
#number_box{
position:absolute;
bottom:0;
z-index:200;
height:25px;
width:650px;
}
.number_list{
float:right;
height:25px;
}
#number_box li{
display:block;
float:left;
color:#000;
background-color:#ccc;
height:20px;
width:20px;
line-height:20px;
text-align:center;
border:1px solid #000;
margin:0 1px;
}
#number_box li.show{
color:#fff;
background-color:#000;
}
#img_box{
width:650px;
height:180px;
overflow:hidden;
}
#img_box div{
width:100000px;
}
#img_box dl{
width:650px;
height:180px;
float:left;
overflow:hidden;
position:relative;
}
#img_box dt{
width:650px;
height:180px;
}
js:
function $get(id,tag){
        if(!tag){
                return document.getElementById(id);
        }else{
                return document.getElementById(id).getElementsByTagName(tag);
        }
}
function mv(){
        var img_box=$get("img_box","");
        img_box.scrollLeft=0;
        var wdth=img_box.offsetWidth;
        var number_box=$get("number_box","li");
        var current=0;
        var mi;
        number_box[current].className="show";
        mn=setTimeout(move_number,5000);
        function move_img(){
                var distance=wdth*current-img_box.scrollLeft;
                var speed=distance>0?Math.ceil(distance/10):Math.floor(distance/10);
                img_box.scrollLeft+=speed;
        }
        function move_number(){
                if(current<number_box.length-1)
                {
                        number_box[current].className="";
                        current++;
                        number_box[current].className="show";
                }else{
                        number_box[current].className="";
                        current=0;
                        number_box[current].className="show";
                }
                move();
        }
        function move(){
                clearInterval(mi);
                clearTimeout(mn);
                mi=setInterval(move_img,15);
                mn=setTimeout(move_number,5000);
        }
        for(var i=0;i<number_box.length;i++){
                manual(i)
        }
        function manual(i){
                number_box.onmouseover=function(){
                        number_box[current].className="";
                        current=i;
                        number_box[current].className="show";
                        move();
                }
        }
        img_box.onmouseover=function(){
                clearInterval(mi);
                clearTimeout(mn);
        }
        img_box.onmouseout=function(){
                mi=setInterval(move_img,15);
                mn=setTimeout(move_number,5000);
        }
}
window.onload=mv；