Danke schonmal für eure Antworten :)
Also das Problem ist, dass man nie weiß, ob nicht vielleicht doch ein besonders langes Wort dabei ist, das keine Whitespaces enthält. Hier mal mein Test für die festen Spaltenüberschriften, vielleicht habt ihr ja auch einen Tipp, wie ich das besser machen könnte, weil so ist ja die Überschrift von dem Inhalt der Tabelle unabhängig und die Spaltenbreiten passen nicht wirklich zueinander!
<HTML>
<HEAD><TITLE>SYSTEM</TITLE></HEAD>
<BODY>
<TABLE STYLE=" border-style:ridge; margin-top:4px;margin-bottom:8px;" WIDTH="94%" id="" ID="" BORDER="" CELLSPACING="" CELLPADING="" FRAME="" RULES="">
<CAPTION STYLE="margin-bottom:6px;margin-top:8pt;font-weight:bold;"></CAPTION>
<COLGROUP ALIGN="" VALIGN="" CHAR="" SPAN="" WIDTH="">
<COL ALIGN="" VALIGN="" WIDTH="3%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="4%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="20%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="11%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="12%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="4%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="3%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="6%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="5%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="9%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="5%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="5%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="10%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="4%" CHAR="" CHAROFF="" SPAN="" />
</COLGROUP>
<THEAD style="font-weight:bold;background-color:#eaeaa5;" ALIGN="" VALIGN="">
<TR STYLE="background-color:#eeeeee;" id="" name="">
<TD valign="top" id="" align="" rowspan="" colspan="">ZO</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">DNI</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">ArtikelKurzbezeichnung</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">Projektbezeichnung</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">Versorgungsnummer</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">DQL</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">ABC</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">LNC</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">USU1</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">Abmessungen</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">UWU1</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">Gewicht</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">Teilekennzeichen</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">FCM</TD>
</TR>
</THEAD>
</TABLE>
<div style="width:95%; height:50%; overflow:auto;">
<TABLE STYLE=" border-style:ridge; margin-top:4px;margin-bottom:8px;" WIDTH="100%" id="" ID="" BORDER="" CELLSPACING="" CELLPADING="" FRAME="" RULES="">
<COLGROUP ALIGN="" VALIGN="" CHAR="" SPAN="" WIDTH="">
<COL ALIGN="" VALIGN="" WIDTH="3%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="4%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="20%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="11%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="12%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="4%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="3%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="6%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="5%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="9%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="center" VALIGN="" WIDTH="5%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="5%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="10%" CHAR="" CHAROFF="" SPAN="" />
<COL ALIGN="" VALIGN="" WIDTH="4%" CHAR="" CHAROFF="" SPAN="" />
</COLGROUP>
<TBODY STYLE="background-color:#eeeeee;" ALIGN="" VALIGN="" CHAR="" CHAROFF="" SPAN="">
<TR STYLE="background-color:#eeeeee;" id="zo0" name="">
<TD valign="top" id="" align="" rowspan="" colspan="">0</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">1</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">FAHRZEUG</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">n.v.</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">1234-12-355-0383</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">0</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">AE</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">D91</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">n.v.</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">n.v.</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">n.v.</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">n.v.</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">A1Z12345678</TD>
<TD valign="top" id="" align="" rowspan="" colspan="">C1234</TD>
</TR>
<!-- Es folgen viele weitere TR -->
</TBODY>
</table>
</div>
</basefont></BODY>
</HTML>
Gruß Kai