Problemer med tabels i Netscape/Firefox/Opera men ikke IE

Jeg er ved at lave denne side www.foldager-ib.dk

Problemet er at det ser ok ud i IE (som altid) men fatter ikke de andre laver fejl i højden.

Er der nogen der har en idé til en løsning??
Kan lave det samme med div's måske er det beder ??? Men ville være ked af at skulle starte all over :)

Her er koden:

<div id="content" style="position: absolute; width: 779px; height: 600px; border: 0px solid red;">
  <table border="1" cellpadding="0" cellspacing="0">
    <tr height="57">
      <td colspan="2" rowspan="3" width="266"><img src="./img/Logo_left.jpg"></td>
      <td colspan="3" width="513"><img src="./img/head.gif"></td>
    </tr>
    <tr height="10">
      <td rowspan="4" width="6" valign="top"><img src="./img/line_right_logo.gif"></td>
      <td width="495" background="./img/line_top.gif"><img src="./img/spacer.gif"></td>
      <td width="12"><img src="./img/corner_right_top.gif"></td>
    </tr>
    <tr height="236">
      <td rowspan="3" width="495" valign="TOP">
<?php
//                                                              Skriv den aktuelle sides indhold
    if (file_exists($sti)) {
        require($sti);
    } else {
        echo('<font color="#FF0000">Ingen side fundet!</font>');
    }
?>
      </td>
      <td rowspan="3" width="12" background="./img/line_right.gif"><img src="./img/spacer.gif"></td>
    </tr>
    <tr height="3">
      <td width="14"><img src="./img/corner_left_logo.gif"></td>
      <td width="252" rowspan="2" valign="top">Menu</td>
    </tr>
    <tr height="273">
      <td width="14" background="./img/line_left.gif"><img src="./img/spacer.gif"></td>
    </tr>
    <tr height="17">
      <td width="16"><img src="./img/corner_left_botton.gif"></td>
      <td colspan="3" width="751" background="./img/line_bottom.gif"><img src="./img/spacer.gif"></td>
      <td width="12"><img src="./img/corner_right_bottom.gif"></td>
    </tr>
  </table>
</div>