Help with directory listing code

["Joker7" <sat_ring@xxxxxxxxxxx>]

Hi -
I'm having a bit of a problem with this directory listing code, found it 
some time ago and have been modifying it.I have run up against one or two 
problems.

1\ How can I make it not list its self
2\ Is there away to specify what files it list
3\add a more clear back button

My php is not that good and I have hit a wall so any help would be 
appreciated.

Chris

<?php
 $allow_parent = "false";
 $path=$_GET["path"];
 $SCRIPT_NAME=getenv("SCRIPT_NAME");
 if (!isset($path)) { $path = "./"; }
 if (strstr($path,"..")) { echo "<h2>No path!</h2>"; exit; }
 $base_dir = getcwd();
 chdir($path);
 $current_dir = getcwd();
 $directory = dir("./");
 $directories_array = array();
 $files_array = array();
 while ($file = $directory->read()) {
  if (is_dir($file) AND $file != ".")  { $directories_array[] = $file; }
  if (is_file($file))    { $files_array[] = $file; }
 }

 $directory->close();
 echo "";
 echo "<table width=100% border=0 cellspacing=0 cellpadding=0>";
 echo "<th>Name</th><th width=50>Size</th><th width=70>Date</th></tr>";
 sort($directories_array);
 foreach($directories_array as $value) {
  if ($value=="..") { 
$new_path=strrev(substr(strstr(substr(strstr(strrev($path),"/"),1),"/"),1)); 
 }
  else   { $new_path=$path.$value; }
  if (($value != "..") OR ($base_dir != $current_dir)) {
   echo "<tr><td><font face=Verdana size=1><a 
href=\"$SCRIPT_NAME?path=".urlencode($new_path."/")."\"><b>$value</b></a></font></td><td></td><td><font 
face=Arial size=1>".gmdate("M Y",filemtime($value))."</font></td></tr>"; }
  elseif ($allow_parent == "true") {
   echo "<tr><td></td><td></td><td></td></tr>"; }
 }
 sort($files_array);
 foreach($files_array as $value) {
  if($value != basename($SCRIPT_NAME) or $path!="./") {
   $filesize=filesize($value);
   if  ($filesize > 1073741823) { $filesize = 
sprintf("%.1f",($filesize/1073741824))." GB"; }
   elseif  ($filesize > 1048575)  { $filesize = 
sprintf("%.1f",($filesize/1048576))." MB"; }
   elseif  ($filesize > 1023)  { $filesize = 
sprintf("%.1f",($filesize/1024))." kB"; }
   else    { $filesize = $filesize." byte"; }
   echo "<tr><td><font face=Verdana 
size=1><i>$value</i></font></td><td><font face=Arial 
size=1>$filesize</font></td><td><font face=Arial size=1>".gmdate("M 
Y",filemtime($value))."</font></td></tr>";
  }
 }
 echo "</table>";
 echo "";
 echo "";
?> 

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