上移下移 没有效果 jQuery

[qqzeng-ip]

<script src="_scripts/jquery-1.3.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
         function MoveDown() {
             var selectedOption = $('#ListBox1 > option[selected]');
             var nextOption = $('#ListBox1 > option[selected]').next("option");            
             if ($(nextOption).text() != "") {              
                 $(selectedOption).remove();
                 $(nextOption).after($(selectedOption));
             }                 
         }
         function MoveUp() {
             var selectedOption = $('#ListBox1>option[selected]');
             var prevOption = $('#ListBox1>option[selected]').prev("option");             
             if ($(prevOption).text() != "") {
                 $(selectedOption).remove();
                 $(prevOption).before($(selectedOption));
             }
           }
 

    </script>  

[qqzeng-ip]

no one ?

[qqzeng-ip]

？？

[qqzeng-ip]

*

[wuyq11]

function UpOrDownOption(Sel,direction)
{
var Op=Sel.options;
var selectedNub=0;
for(var i=0;i<Op.length;i++)
{
if(Op[i].selected)
{
selectedNub++;
}
}
if(selectedNub==0)
{
alert("请选择一项！");
return;
}
if(selectedNub>1)
{
alert("只能选择一项！");
return;
}
i=Sel.selectedIndex;
var selectedOp=document.createElement("option");
selectedOp.text=Op[i].text;
selectedOp.value=Op[i].value;
selectedOp.selected=true;

if(direction=="up")
{
if(i!=0)
{
Sel.options.add(selectedOp,i-1);
Sel.options.remove(i+1);
}

}
if(direction=="down")
{
if(i!=Op.length-1)
{
Sel.options.add(selectedOp,i+2);
Sel.options.remove(i);
}
}

}

[qqzeng-ip]

帮我看看我的源代码 为什么ie8不行

[qqzeng-ip]

——