expose resource URL as well

core/src/main/resources/lib/layout/layout.jelly

@@ -97,7 +97,7 @@ THE SOFTWARE.
     <link rel="shortcut icon" href="${resURL}/favicon.ico" type="image/vnd.microsoft.icon" />
 
     <!-- are we running as an unit test? -->
-    <script>var isRunAsTest=${h.isUnitTest}; var rootURL="${rootURL}";</script>
+    <script>var isRunAsTest=${h.isUnitTest}; var rootURL="${rootURL}"; var resURL="${resURL}";</script>
 
     <script src="${resURL}/scripts/prototype.js" type="text/javascript"/>
     <script src="${resURL}/scripts/behavior.js" type="text/javascript"/>