[PHP] NULL value for variable

[Narvaez, Teresa]

Hello, 
        I am runnig php 4.1.1.  In the configuration, register_globals is
ON.  
I have two programs and I want to pass the value from fileId from one.php to
downloadfile.php.  However, in downloadfile.php $fileId is NULL.  What am I
missing?  Thanks, -Teresa 


one.php
      <td width="33%" bgcolor="#FFDCA8" height="21">
      <p style="margin-left: 10">
      <font face="Verdana" size="1">
      <a href="downloadfile.php?fileId=<?php echo $row["PicNum"]; ?>" >
         Download Now
      </a></font>
      </td>
      </tr>   

downloadfile.php
      <?
      global $fileId;

      if ( ! is_numeric($fileId) )
      die ("Invalid PictureNumber specified: ($fileId)");

      ?>