求JS 的 DropDownList联动 送分啦！
<tr class="FontFamily">
            <td class="td" style="width: 16%; height: 24px">
                &nbsp;计划类型<span style="color: #ff0000">*</span>
            </td>
            <td class="td1" colspan="3" style="width: 33%; height: 24px">
                <asp:DropDownList ID="CT_JHLX" runat="server" BorderStyle="None" Style="border-top-width: 0px;
                    border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" Width="99.7%" AutoPostBack="True" OnSelectedIndexChanged="CT_JHLX_SelectedIndexChanged">
                    <asp:ListItem>年度计划</asp:ListItem>
                    <asp:ListItem>月度计划</asp:ListItem>
                </asp:DropDownList> 
            </td>
            <td class="td" style="width: 16%; height: 24px">
                &nbsp;计划时间<span style="color: #ff0000">*</span>
            </td>
            <td class="td1" id="year" style="width: 33%; height: 24px">
                     <table align="left" border="0" cellpadding="0" cellspacing="0" unselectable="off" width="99.9%">
                    
                    <tr unselectable="off">
                        <td style="height: 17px">
                            <asp:DropDownList ID="CT_Year" runat="server" BorderStyle="None" Style="border-top-width: 0px;
                    border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" Width="80%">
                                <asp:ListItem>2010年</asp:ListItem>