Changed the HREF for Java GUI to the https one.

www/tutorial/tutorial.html

@@ -56,7 +56,7 @@ Later sections of the tutorial will cover more advanced topics such as
 loading your own RPMs automatically, running programs automatically,
 running batch jobs, creating your own disk images and loading those
 images on your nodes. For your convenience, there is also a 
-<a href="../buildui/bui.php3">Java GUI</a>
+<a href="https://www.emulab.net/buildui/bui.php3">Java GUI</a>
 interface you can use to create NS files for your experiments.
 </p>
 
@@ -92,7 +92,7 @@ getting an Emulab account, go to the <b><a href =
 Part of Emulab's power lies in its ability to assume many different
 topologies; the description of a such a topology is a necessary part
 of an experiment. (Note: You may want to take a look at our 
-<a href="../buildui/bui.php3">Java GUI</a> to build experiments 
+<a href="https://www.emulab.net/buildui/bui.php3">Java GUI</a> to build experiments 
 without directly editing NS files.)
 
 <p>