You should add the CELLSPACING=0 and CELLPADDING=0 attributes to your TABLE tag, like so:
<table cellspacing=0 cellpadding=0> ...table contents here... </table>
Sven Neuhaus replies:
To have no space whatsoever between table cells in Netscape, you also need the BORDER=0 attribute. Netscape will not show a border by default, but it seems to have an invisible border=1 if you omit the border attribute.