Signature images upload

Hi guys.

I have tried to make a upload script. What i really wanted it to di, was that i implented it to the board and when i fellow upload a file, the nickname will be the file name too.

But i can`t get it to work, so i ask here... please help ?!?!

Here`s the code:

PHP Code:

 <?php

 $file_dir="/home/board/www/forums/images/sigs/";
 $url_prefix="http://www.your.url/forums/images/sigs/";
 $max_kilobytes = 2048;

 if($userfile && $newname)
 {
     $userfile_name=basename($userfile_name);

     if(stristr($userfile_name, ".php"))
     {
         die("Sorry you are not allowed to upload php-scripts.");
     }

     if ($userfile == "none") // image > $max_kilobytes
     {
         echo "Image rejected: exceeds max size ($max_kilobytes k) - please upload a smaller image";
     } else {

         if (file_exists($file_dir.$newname))
         {
             echo "Image rejected: a file called '$newname' already exists - please choose another name.";
         } else {
             if (copy($userfile, $file_dir.$newname))
             {
                 unlink($userfile);
                 echo "File successfully uploaded. Paste this text:<br>";
                 echo "<textarea rows=\"2\" cols=\"60\">?$url_prefix$newname</textarea><br />";
                 echo "to place this image: <br><img src=\"$url_prefix$newname\">";
             } else {
                 echo "Upload failed...";
             }
         }
     }
 }

 ?>
 <hr>

 <form enctype="multipart/form-data" action="sig.php" method=post>

 <input type="hidden" name="MAX_FILE_SIZE" value="<?php echo ($max_kilobytes * 1000); ?>">

 <p>
     Select file to send:<br>
     <input name="userfile" type="file"><br>
     (Images should be 300 pixels wide or less and under <?php echo $max_kilobytes; ?>k)
 </p>

 <p>
     Call this file:<br>
     <input type="text" name="newname" value="PictureName.jpg"> (must end in .jpg or .gif)<br>
     (Please only press once - depending on the size of the graphic it may take a while to upload).
 </p>

 <input type="submit" value="Send file">

 </form>
 </body>
 </html>