kan ikke få den til at slette mappe (b-one)

<?
if ($_POST[delmappe]){
$delmaps = $_POST[delmap];
rmdir("$delmaps");
echo "<SCRIPT>alert(\"mappen er slettet \");location.href='admintools.php';</SCRIPT>";
}
?>

<FORM ACTION="" METHOD="POST" name="delmappe"><BR>
Vælge mappe:<br>
<select style="background-color:#EFDBCE; font-size:10pt;" name="delmap">
<?
$dir = "$_SESSION[bruger]";

$handle = opendir($dir);

while (false !== ($file = readdir($handle))) {
    if ($file != "." && $file != ".." && $file != "_vti_cnf") {


      if (is_dir($dir."/".$file)) {

// mappe visse her
echo "<option value='$dir/$file'>$dir/$file</option>\n";
}
}
}
closedir($handle);
?>
</select>
<INPUT TYPE="submit" VALUE="slet mappe" NAME="delmappe"><br>
</FORM>