Merge pull request #2 from danieljames/link-fix

Fix link to test.

cast.htm

@@ -31,7 +31,7 @@
     "#Polymorphic_cast"><code>polymorphic_downcast</code></a> function templates designed to
     complement the C++ built-in casts.</p>
 
-    <p>The program <a href="cast_test.cpp">cast_test.cpp</a> can be used to
+    <p>The program <a href="test/cast_test.cpp">cast_test.cpp</a> can be used to
     verify these function templates work as expected.</p>
 
     <h3><a name="Polymorphic_cast">Polymorphic casts</a></h3>