Hallo,
mit folgenden Quelltext erscheint im IE6 (aber im Firefox) unter Windows kein Rand/keine Abtrennung zwischen dem Main-Inhalt und dem rechten Inhalt. Vielen Dank für Feedback!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Site</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<table width="780" border="0" cellspacing="0" cellpadding="0">
<tr>
<td colspan="8"><img src="banner.jpg" width="780" height="93"></td>
</tr>
<tr>
<td rowspan="4" bgcolor="B0B7DD"><img name="blind" src="" width="10" height="1" alt=""></td>
<td bgcolor="B0B7DD"> <img name="blind" src="" width="1" height="10" alt="">
</td>
<td bgcolor="B0B7DD" rowspan="4"><img name="blind" src="" width="10" height="1" alt=""></td>
<td rowspan="3" bgcolor="D4D5EA"><img name="blind" src="" width="10" height="1" alt=""></td>
<td bgcolor="D4D5EA"> <img name="blind" src="" width="1" height="10" alt="">
</td>
<td rowspan="3" bgcolor="D4D5EA"><img name="blind" src="" width="10" height="1" alt=""></td>
<td bgcolor="D4D5EA"><img name="blind" src="" width="1" height="10" alt=""></td>
<td rowspan="3" bgcolor="D4D5EA"><img name="blind" src="" width="10" height="1" alt=""></td>
</tr>
<tr>
<td valign="top" width="190" bgcolor="B0B7DD">
<p>Navi links</p>
<p>linker Inhalt</p>
</td>
<td rowspan="2" width="360" valign="top" bgcolor="EFEFF7">
<div style="margin:5px;">Main</div>
</td>
<td rowspan="2" width="180" valign="top" bgcolor="EFEFF7">
<div style="margin:5px;">rechter Inhalt</div>
</td>
</tr>
<tr>
<td valign="bottom" bgcolor="B0B7DD"> <img src="logo.gif" width="61" height="75"></td>
</tr>
<tr>
<td valign="bottom" bgcolor="B0B7DD"> </td>
<td valign="bottom" bgcolor="D4D5EA"><img name="blind" src="" width="1" height="20" alt=""></td>
<td valign="middle" colspan="4" bgcolor="D4D5EA">Footer</td>
</tr>
</table>
</body>
</html>