Fixed tutorial links, especially to external pages
diff --git a/dev/js/src/tutorial.js b/dev/js/src/tutorial.js
index a028b8e..55c2415 100644
--- a/dev/js/src/tutorial.js
+++ b/dev/js/src/tutorial.js
@@ -78,7 +78,6 @@
       this.hide();
     },
 
-
     /**
      * Decorate a page with query event handler.
      */
@@ -92,6 +91,20 @@
       };
     },
 
+    /**
+     * Decorate a page with documentation links
+     */
+    initDocLinks : function (d) {
+      var dl = d.getElementsByClassName('doc-link');
+      var that = this;
+      for (var i = 0; i < dl.length; i++) {
+	dl[i].onclick = function (e) {
+	  that.setPage(this.getAttribute('href'));
+	  return true;
+	};
+      };      
+    },
+
 
     /**
      * Show the tutorial page embedded.