index.html: links to open legacy and Helios IDEs

internal/index.html

@@ -15,10 +15,10 @@
         ["amber/devel"],
         function (smalltalk) {
             smalltalk.initialize({'transport.defaultAmdNamespace': "amber_core"});
-
-            smalltalk.globals.Browser._open();
         }
     );
 </script>
+<p>To start legacy in-page IDE, <a href="javascript:require('amber/helpers').globals.Browser._open()">click here</a>.</p>
+<p>To popup Helios IDE, <a href="javascript:require('amber/helpers').popupHelios()">click here</a>.</p>
 </body>
 </html>