新人求帮助，jQuery隐藏问题
我想把以下代码在document.all["ddlType"].value等于7或者8的时候用jQuery隐藏在首页，不知道怎么写
<tbody id="DataSourceSet"> <tr style="background-color: #f7f7f7" id="tr1"> <td style="height: 22px" class="tdListRight"> <span style="color:Black;font-weight:bold">数据源设置</span></td> <td> </td> </tr> <tr id="tr2"> <td style="height: 22px; background-color: #f7f7f7" align="right" class="tdListLeft"> 数据源：</td> <td style="height: 22px; text-align: left" class="tdListRight"> <asp:DropDownList ID="ddlDataSource" runat="server" CssClass="button"> </asp:DropDownList> </td> </tr> <tr> <td align="right" class="tdListLeft" style="height: 22px; background-color: #f7f7f7"> 同步策略</td> <td class="tdListRight" style="height: 22px; text-align: left"> <table class="adminform"> <tr> <td style="height: 26px; text-align: left" colspan="2"> <asp:CheckBox ID="chkAutoSyn" runat="server" Text="自动同步数据源" AutoPostBack="True" OnCheckedChanged="chkAutoSyn_CheckedChanged" /></td> </tr> <tbody id="Tbody1"> <tr> <td style="height: 26px; text-align: left" colspan="2"> <asp:RadioButtonList ID="rblDSKind" runat="server" AutoPostBack="True" OnSelectedIndexChanged="rblDSKind_SelectedIndexChanged" Enabled="False"> <asp:ListItem Value="0" Selected="True">每天运行一次</asp:ListItem> <asp:ListItem Value="1">每天运行多次</asp:ListItem> </asp:RadioButtonList> </td> </tr> </tbody> <tbody id="Tbody2"> <tr> <td style="height: 22px; background-color: #f7f7f7" align="right" class="tdListLeft"> 开始时间： </td> <td style="height: 22px; text-align: left" class="tdListRight"> <asp:TextBox ID="txtDSStart" runat="server" Width="75px"></asp:TextBox> <asp:RequiredFieldValidator ID="rfvDSStart" runat="server" ControlToValidate="txtDSStart" ErrorMessage="*" Enabled="false"></asp:RequiredFieldValidator> <asp:RegularExpressionValidator ID="RegularExpressionValidator3" runat="server" ControlToValidate="txtDSStart" ErrorMessage="时间格式不正确！格式：00:00:00." ValidationExpression="\d{2}:\d{2}:\d{2}"></asp:RegularExpressionValidator></td> </tr> </tbody> <tbody id="Tbody3"> <tr> <td style="height: 22px; background-color: #f7f7f7" align="right" class="tdListLeft"> 结束时间： </td> <td style="height: 22px; text-align: left" class="tdListRight"> <asp:TextBox ID="txtDSEnd" runat="server" Width="75px" Enabled="False"></asp:TextBox> <asp:RequiredFieldValidator ID="rfvDSEnd" runat="server" ControlToValidate="txtDSEnd" ErrorMessage="*" Enabled="False"></asp:RequiredFieldValidator> <asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server" ControlToValidate="txtDSEnd" ErrorMessage="时间格式不正确！格式：00:00:00." ValidationExpression="\d{2}:\d{2}:\d{2}"></asp:RegularExpressionValidator></td> </tr> <tr> <td style="height: 22px; background-color: #f7f7f7" align="right" class="tdListLeft"> 间隔时间： </td> <td style="height: 22px; text-align: left" class="tdListRight"> <asp:TextBox ID="txtDSInterval" runat="server" Width="40px" Enabled="False">10</asp:TextBox> <span style="color:Black">（单位：分钟）</span><asp:RequiredFieldValidator ID="rfvDSInterval" runat="server" ControlToValidate="txtDSInterval" ErrorMessage="*" Enabled="False"></asp:RequiredFieldValidator> <asp:RegularExpressionValidator ID="revDSInterval" runat="server" ControlToValidate="txtDSInterval" ErrorMessage="只能是正整数" ValidationExpression="\d+"></asp:RegularExpressionValidator></td> </tr> </tbody> </table> </td> </tr> </tbody>