如何根据列条件设置默认颜色

<table cellspacing="2" cellpadding="2" align="Center" border="0" id="ctl00_centerContent_GridView1" style="border-color:Gray;border-width:1px;border-style:solid;">
    <tbody>
        <tr style="background-color:SeaShell;">
            <td class="nonpar" style="color:Red;font-weight:bold;"><a href="/go.html?url=javascript:void(0);" style="color: black; cursor: default;">Entry #1</a></td>
            <td align="center" style="color:Red;">&nbsp;</td>
            <td align="center">N</td>
            <td>&nbsp;</td>
        </tr>
        <tr style="background-color:SeaShell;">
            <td class="nonpar" style="color:Red;font-weight:bold;"><a href="/go.html?url=javascript:void(0);" style="color: black; cursor: default;">Entry #2</a></td>
            <td align="center" style="color:Red;">&nbsp;</td>
            <td align="center">N</td>
            <td>&nbsp;</td>
        </tr>
        <tr style="background-color:SeaShell;">
            <td class="nonpar" style="color:Red;font-weight:bold;"><a href="/go.html?url=javascript:void(0);" style="color: black; cursor: default;">Entry #3</a></td>
            <td align="center" style="color:Red;">&nbsp;</td>
            <td align="center">Y</td>
            <td>&nbsp;</td>
        </tr>
        <tr style="background-color:SeaShell;">
            <td class="nonpar" style="color:Red;font-weight:bold;"><a href="/go.html?url=javascript:void(0);" style="color: black; cursor: default;">Entry #4</a></td>
            <td align="center" style="color:Red;">&nbsp;</td>
            <td align="center">Y</td>
            <td>&nbsp;</td>
        </tr>
    </tbody>
</table>
<table cellspacing="2" cellpadding="2" align="C