.net中实现listBox左右移动

div style="width:200px; float:left;">
    table>
    tr>
        td  width="50%">
        asp:ListBox ID="ListBox2" runat="server" Height="128px" Width="148px">
            asp:ListItem Value="张三">/asp:ListItem>
            asp:ListItem Value="李四">/asp:ListItem>
            asp:ListItem>王五/asp:ListItem>
            /asp:ListBox>
        /td>
        td>
            asp:Button ID="Button2" runat="server" Text="《">/asp:Button>
            asp:Button ID="Button1" runat="server" Text="">/asp:Button>
            asp:Button ID="Button3" runat="server" Text=">">/asp:Button>
            asp:Button ID="Button4" runat="server" Text="》">/asp:Button>
        /td>
        td align="left" width="50%">
             asp:ListBox ID="ListBox1" runat="server" Height="128px" Width="148px">/asp:ListBox>
        /td>
    /tr>
    /table>
    /div>