css不起作用~~急,不够加分
<!--右侧-->
<td valign="top">
<table cellpadding="0" cellspacing="0" style="width:98.5%; margin-left:5px; padding-top:4px;">
<!--帮助及服务begin-->
<tr>
<td>
<table cellpadding="0" cellspacing="0" style="margin-top:-1px; width:100%;" >
<tr>
<td style="height:24px;width:10px;" class="WebPartLeft"></td>
<td style="font-weight:bold;color:#0a3d6b;font-size: 12px;" background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif">帮助及服务</td>
<td background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif"> </td>
<td align="right" valign="middle" background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif">
</td>
<td style="height:24px;width:10px;" class="WebPartRight"></td>
</tr>
</table>
<table cellpadding="0" cellspacing="0" style=" height:138px; width:100%;background-color:#ffffff;border-right: #b1b1b1 1px solid; border-left: #b1b1b1 1px solid; border-bottom: #b1b1b1 1px solid; margin-bottom:4px;">
<tr>
<td>
<cc1:TongHelp runat="server" ID="tongHelp" />
</td>
</tr>
</table>
</td>
</tr>
<!--帮助及服务End-->
<!--预留位置begin-->
<tr>
<td>
<table cellpadding="0" cellspacing="0" width="100%">
<tr>
<td>
<table cellpadding="0" cellspacing="0" style="margin-top:-1px; width:100%;" >
<tr>
<td style="height:24px;width:10px;" class="WebPartLeft"></td>
<td style="font-weight:bold;color:#0a3d6b;font-size: 12px;" background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif">预留位置</td>
<td background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif"> </td>
<td align="right" valign="middle" background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif">
</td>
<td style="height:24px;width:10px;" class="WebPartRight"></td>
</tr>
</table>
<table cellpadding="0" cellspacing="0" style="background-color:#ffffff;border-right: #b1b1b1 1px solid; border-left: #b1b1b1 1px solid; border-bottom: #b1b1b1 1px solid; width:100%; margin-bottom:4px; height:138px;">
<tr>
<td>
<%--<cc2:LinkList ID="LinkList2" SelectControls="3" ImgSRC="../UFControls/Ufida/Images/Portal/webpart-point.gif" runat="server" />--%>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<!--预留位置End-->
<!--了解更多内容begin-->
<tr>
<td>
<table cellpadding="0" cellspacing="0" width="100%">
<tr>
<td>
<table cellpadding="0" cellspacing="0" style="margin-top:-1px; width:100%;" >
<tr>
<td style="height:24px;width:10px;" class="WebPartLeft"></td>
<td style="font-weight:bold;color:#0a3d6b;font-size: 12px;" background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif">了解更多内容</td>
<td background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif"> </td>
<td align="right" valign="middle" background="../App_Themes/<%=ThemeName%>/Images/Portal/webpart-title-middle.gif">
</td>
<td style="height:24px;width:10px;" class="WebPartRight"></td>
</tr>
</table>
<table cellpadding="0" cellspacing="0" style="background-color:#ffffff;border-right: #b1b1b1 1px solid; border-left: #b1b1b1 1px solid; border-bottom: #b1b1b1 1px solid; width:100%; margin-bottom:5px; height:138px;">
<tr>
<td>
<cc2:LinkList ID="LinkList1" SelectControls="3" ImgSRC="../UFControls/Ufida/Images/Portal/webpart-point.gif" runat="server" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<!--了解更多内容End-->
</table>
</td>
这段代码的边框和背景色的样式不起作用style="background-color:#ffffff;border-right: #b1b1b1 1px solid; border-left: #b1b1b1 1px solid; border-bottom: #b1b1b1 1px solid; width:100%; margin-bottom:4px; height:138px;"