gæstebog baggrund? center?

Hvordan får jeg en baggrund på min gæstebog så det ligger den ved været nyt indlæg? og hvordan får jeg det til at være centeret?
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          <td width="100%" height="161" align="center"> <center><?php


require("./gbog-ting/mysql-funktioner.php");
require("./gbog-ting/design-funktioner.php");
require("./gbog-ting/indstillinger.php");


if(is_array($HTTP_GET_VARS)) {
  $start_nr = $HTTP_GET_VARS['start_nr'];
} elseif (is_array($_GET)) {
  $start_nr = $_GET['start_nr'];
}



if(!$start_nr || $start_nr < 0) {
  $start_nr = 0;
}







$sql = "select id, navn, epost, date_format(tid, '%e/%c %Y, %H:%i') as tiden, besked from gaestebog order by tid desc limit $start_nr, $antal_ad_gangen";
$taeller_sql = "select count(*) as antal from gaestebog";



aabn_forbindelse_og_vaelgdb();
$resultat = sql_spoerg_og_faa_svar($sql);
$optaelling = sql_spoerg_og_faa_svar($taeller_sql);
luk_forbindelse();


extract($optaelling[0]);


if($antal > ($start_nr + $antal_ad_gangen)) {
   
    $naeste_start_nr = $start_nr + $antal_ad_gangen;
    $naeste_nav = "<a href=\"$PHP_SELF?start_nr=$naeste_start_nr\">N&aelig;ste</a>";

} else {

    $naeste_nav = "<span class=\"doedt-link\">N&aelig;ste</span>";

}


if($start_nr > 0 && ($start_nr - $antal_ad_gangen) < $antal) {

    $forrige_start_nr = $start_nr - $antal_ad_gangen;
    $forrige_nav = "<a href=\"$PHP_SELF?start_nr=$forrige_start_nr\">Forrige</a>";

} else {

    $forrige_nav = "<span class=\"doedt-link\">Forrige</span>";

}


$nav = "<table width=\"$tabel_bredde\" border=\"0\" cellpadding=\"5\" cellspacing=\"0\"background= http://monstar99.users.whitehat.dk/bibliotek_med_gaestebogen_i/baggbog.jpg>
    <tr><td align=\"left\" width=\"33%\">$forrige_nav</td>
    <td align=\"center\" width=\"34%\"><a href=\"skriv.php\">Skriv</a></td>
    <td align=\"right\" align=\"33%\">$naeste_nav</td></tr>
    </table>";



echo "$nav <p />";


if(count($resultat) < 1) {

  echo "Der er ingen indl&aelig;g i gBogen";

} else {

  for($i=0;$i<count($resultat);$i++) {

   
   
    extract($resultat[$i]);

   

    $besked = stripslashes($besked);
    $navn = stripslashes($navn);
    $epost = stripslashes($epost);

   

    if($html_p != "t") {
        $navn = htmlentities($navn);
        $epost = htmlentities($epost);
        $besked = htmlentities($besked);
    }

   
    $besked = nl2br($besked);

   

    if(ereg("@", $epost)) {
        $navn = "<a href=\"mailto:$epost\">$navn</a>";
    }

   
?></center>

    <center><table width=" <?php echo $tabel_bredde; ?>" cellpadding="1" cellspacing="0" border="0">
        <tr><td class="gbog-baggrund" width="100%" align="center">

            <table align="center" border="0" cellpadding="8" cellspacing="0" width="100%">
                <tr><td class="gbog-top" width="100%">Skrevet af: <strong><?php echo $navn; ?></strong>, <?php echo $tiden; ?></td></tr>
            </table>

        </td></tr><tr><td class="gbog-baggrund" align="center" width="100%">

            <table border="0" cellpadding="8" cellspacing="0" width="100%">
                <tr><td class="gbog-bund" width="100%">
                <?php echo $besked; ?>
                <p align="right"><a class="slet" href="<?php echo "slet.php?id=$id&start_nr=$start_nr"; ?>">slet</a></p></td></tr>
            </table>

        </td></tr>
    </table></center>
              </table>  </table>
  <center>
</center>
<center>
  <p />

<?php

 

  }



  echo $nav;


}



echo bund();

?></center></html>