Add two "new" icons. Not sure we want to do this all the time

due to maint and other downsides, but these are here for now.

www/doc/exclasses.html

@@ -49,6 +49,7 @@
 <!-- xxx URL goes to a PDF file; needs fixing -->
 <!--CS590D <br>--><b>Purdue University</b>:<br> 
 <a href="http://www.cerias.purdue.edu/homes/crisn/courses/cs590D/">CS50D Security Topics in Networks and Distributed Systems</a>
+	<img src="/new.gif" alt="[NEW]">
 </li><br>
 
 <li>
@@ -61,6 +62,7 @@
 <a href="http://www.eecis.udel.edu/~sunshine/courses/F03/CIS659/">CIS659 Introduction to Network Security</a>
 <br>
 <a href="http://www.cis.udel.edu/~sunshine/courses/S04/CIS859/">CIS859 Advanced Topics in Network Security</a>
+	<img src="/new.gif" alt="[NEW]">
 </li><br>
 
 <li>