If you're using background colors or images in table cells, and you look at your page in netscape 6+, if one of your table cells doesn't actually have anything in it… (ie. one or more cells look like this)
<td></td>
Then nothing will show up in those cells: no background image. no background color.
CSS to the rescue!!
Put this in your stylesheet and all should be well:
table
{
empty-cells: show
}