3 værider i en list menu

Her er noget du nok kan rette til:

<?
$new_value = 'Submenu ID: '.$row_rsSubmenu['id'].' Submenu MAIN ID: '.$row_rsSubmenu['mainid']
?>
<form method="POST" action="<?=$_SERVER['PHP_SELF']?>?mode=vis">
<select name="hest" class="inputBox">
    <option value="<?=$new_value?>"><?php echo $row_rsSubmenu['overskrift']; ?></option>
</select>
<input name="send" type="submit" value="Send">
</form>
<?
if($_GET[mode] == vis){
echo '<textarea name="tekst">'.$_POST[hest].'</textarea>';

}
?>

**Update**

Fik det stortset til at virke - ligepå nær værdien i mit hiddenfield - hvordan får jeg den smidt ind i tekstfeldtet sammen med resten? - mit eget script virker ikke rigtigt... ~:]

<script language="JavaScript" type="text/javascript">
function ChangeText() {
selectedVal = document.InternLinks.ddintern.selectedIndex
document.InternLinks.url.value = "index.php?id=" + document.InternLinks.ddintern.options[selectedVal].value + "mainid="document.InternLinks.mainid.options[selectedVal].value;
}
</script>
<body>
<form method="post" action="" name="InternLinks">
<select name="ddintern" id="intern" onChange="ChangeText()" style="margin-right: 10px; font-size: 10px; width: 100%;">
<option value="">-- interne links --</option>
<?php
do { 
?>
<option value="<?php echo $row_rsIntern['id']?>"><?php echo $row_rsIntern['overskrift']?></option>
      <?php
} while ($row_rsIntern = mysql_fetch_assoc($rsIntern));
  $rows = mysql_num_rows($rsIntern);
  if($rows > 0) {
      mysql_data_seek($rsIntern, 0);
      $row_rsIntern = mysql_fetch_assoc($rsIntern);
  }
?>
</select>
<input type="text" name="url" id="url" value="">
<input name="mainid" type="hidden" id="mainid" value="<?php echo $row_rsIntern['mainid']; ?>">
</form>
</body>
</html>

**update 2**
Okey - fandt selv ud af det - var faktisk så nemt at det er helt pinligt...!

<script language="JavaScript" type="text/javascript">
function ChangeText() {
selectedVal = document.InternLinks.ddintern.selectedIndex
document.InternLinks.url.value = document.InternLinks.ddintern.options[selectedVal].value;
}
</script>
<body>
<form method="post" action="" name="InternLinks">
<select name="ddintern" id="intern" onChange="ChangeText()" style="margin-right: 10px; font-size: 10px; width: 100%;">
<option value="">-- interne links --</option>
<?php
do { 
?>
<option value="index?id=<?php echo $row_rsIntern['id']?>&mainid=<?php echo $row_rsIntern['mainid']; ?>"><?php echo $row_rsIntern['overskrift']?></option>
      <?php
} while ($row_rsIntern = mysql_fetch_assoc($rsIntern));
  $rows = mysql_num_rows($rsIntern);
  if($rows > 0) {
      mysql_data_seek($rsIntern, 0);
      $row_rsIntern = mysql_fetch_assoc($rsIntern);
  }
?>
</select>
<input type="text" name="url" id="url" value="">
</form>
</body>
</html>