diff --git a/whalesong/repl-prototype/htdocs/index.html b/whalesong/repl-prototype/htdocs/index.html
index ed34ab4..e489fe2 100644
--- a/whalesong/repl-prototype/htdocs/index.html
+++ b/whalesong/repl-prototype/htdocs/index.html
@@ -3,8 +3,11 @@
 <head>
 <script src="collects/runtime.js"></script>
 <script src="collects/whalesong-lang.js"></script>
+<script src="repl.js"></script>
 </head>
 <body>
 <h1>Repl experiment</h1>
+
+<input id="repl" type="text" style="width:500px"></input>
 </body>
 </html>
diff --git a/whalesong/repl-prototype/htdocs/repl.js b/whalesong/repl-prototype/htdocs/repl.js
new file mode 100644
index 0000000..591cbe9
--- /dev/null
+++ b/whalesong/repl-prototype/htdocs/repl.js
@@ -0,0 +1,25 @@
+"use strict";
+
+$(document).ready(function() {
+    
+    $("#repl").keypress(function(e) {
+        if (e.which == 13) {
+            var repl = $(this);
+            var src = repl.val();
+            $(this).val("");
+            repl.attr('disabled', 'true');
+            repl.val("... evaluating...");
+            evaluate(src, 
+                     function() { repl.removeAttr('disabled');
+                                  repl.val("");});
+        } 
+    });
+
+    var evaluate = function(src, after) {
+        console.log("about to eval", src);
+
+        // fill me in.
+        setTimeout(after, 1000);
+    };
+
+});
