fixed a series of "next" and "previous" topic links that pointed to the wrong pages.
diff --git a/user_guide/libraries/file_uploading.html b/user_guide/libraries/file_uploading.html
index c1c64a5..f01c6f7 100644
--- a/user_guide/libraries/file_uploading.html
+++ b/user_guide/libraries/file_uploading.html
@@ -419,7 +419,7 @@
 

 <div id="footer">

 <p>

-Previous Topic:&nbsp;&nbsp;<a href="download_helper.html">Download Helper</a>

+Previous Topic:&nbsp;&nbsp;<a href="encryption.html">Encryption Helper</a>

 &nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;

 <a href="#top">Top of Page</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;

 <a href="../index.html">User Guide Home</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;