Wired up the javascript display protocol using eval.

IPython/frontend/html/notebook/static/js/codecell.js

@@ -655,6 +655,8 b' var IPython = (function (IPython) {'
     CodeCell.prototype.append_mime_type = function (json, element) {
         if (json.html !== undefined) {
             this.append_html(json.html, element);
+        } else if (json.javascript !== undefined) {
+            this.append_javascript(json.javascript, element);
         } else if (json.latex !== undefined) {
             this.append_latex(json.latex, element);
         } else if (json.svg !== undefined) {
@@ -676,6 +678,12 b' var IPython = (function (IPython) {'
     };
 
 
+    CodeCell.prototype.append_javascript = function (js, element) {
+        // We just eval the JS code, element appears in the local scope.
+        eval(js);
+    }
+
+
     CodeCell.prototype.append_text = function (data, element, extra_class) {
         var toinsert = $("<div/>").addClass("box_flex1 output_subarea output_text");
         // escape ANSI & HTML specials in plaintext:

IPython/frontend/html/notebook/static/js/notebook.js

@@ -993,7 +993,6 b' var IPython = (function (IPython) {'
         } else if (msg_type === 'status') {
             if (content.execution_state === 'busy') {
                 $([IPython.events]).trigger('status_busy.Kernel');
-                IPython.kernel_status_widget.status_busy();
             } else if (content.execution_state === 'idle') {
                 $([IPython.events]).trigger('status_idle.Kernel');
             } else if (content.execution_state === 'dead') {