In FrontPage, you right click on the table, select Cell Properties and there's a Background Colour option.
If you're not using FP, WHY NOT? heh heh
this is the html that FP created to make a three column, 2 row table with one cell coloured red:
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1">
<tr>
<td width="33%" bgcolor="#FF0000"> </td>
<td width="33%"> </td>
<td width="34%"> </td>
</tr>
<tr>
<td width="33%"> </td>
<td width="33%"> </td>
<td width="34%"> </td>
</tr>
</table>
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