diff --git a/IPython/frontend/html/notebook/static/css/login.css b/IPython/frontend/html/notebook/static/css/login.css
index 41eb790..3cb3d4b 100644
--- a/IPython/frontend/html/notebook/static/css/login.css
+++ b/IPython/frontend/html/notebook/static/css/login.css
@@ -1,5 +1,5 @@
 
-#main_app {
+#ipython-main-app {
     height: 100px;
     width: 350px;
     margin: 50px auto;
diff --git a/IPython/frontend/html/notebook/static/css/logout.css b/IPython/frontend/html/notebook/static/css/logout.css
index 7767494..231eea2 100644
--- a/IPython/frontend/html/notebook/static/css/logout.css
+++ b/IPython/frontend/html/notebook/static/css/logout.css
@@ -1,5 +1,5 @@
 
-#main_app {
+#ipython-main-app {
     height: 100px;
     width: 200px;
     margin: 50px auto;
diff --git a/IPython/frontend/html/notebook/static/css/notebook.less b/IPython/frontend/html/notebook/static/css/notebook.less
index 926c09d..3028e5d 100644
--- a/IPython/frontend/html/notebook/static/css/notebook.less
+++ b/IPython/frontend/html/notebook/static/css/notebook.less
@@ -92,7 +92,7 @@ span#notebook_name {
 }
 
 
-div#main_app {
+#ipython-main-app {
     width: 100%;
     position: relative;
 }
diff --git a/IPython/frontend/html/notebook/static/css/projectdashboard.css b/IPython/frontend/html/notebook/static/css/projectdashboard.css
index 640fb84..7cf6c4b 100644
--- a/IPython/frontend/html/notebook/static/css/projectdashboard.css
+++ b/IPython/frontend/html/notebook/static/css/projectdashboard.css
@@ -5,7 +5,7 @@
  * Author: IPython Development Team
  */
 
-#main_app {
+#ipython-main-app {
     width: 920px;
     margin: 30px auto 0px auto;
 }
diff --git a/IPython/frontend/html/notebook/static/js/layoutmanager.js b/IPython/frontend/html/notebook/static/js/layoutmanager.js
index b599e93..00949ee 100644
--- a/IPython/frontend/html/notebook/static/js/layoutmanager.js
+++ b/IPython/frontend/html/notebook/static/js/layoutmanager.js
@@ -43,7 +43,7 @@ var IPython = (function (IPython) {
     LayoutManager.prototype.do_resize = function () {
         var app_height = this.app_height()  // content height
 
-        $('div#main_app').height(app_height);  // content+padding+border height
+        $('#ipython-main-app').height(app_height);  // content+padding+border height
 
         var pager_height = IPython.pager.percentage_height*app_height;
         var pager_splitter_height = $('div#pager_splitter').outerHeight(true);
diff --git a/IPython/frontend/html/notebook/static/js/loginmain.js b/IPython/frontend/html/notebook/static/js/loginmain.js
index 503f1ea..9718fb5 100644
--- a/IPython/frontend/html/notebook/static/js/loginmain.js
+++ b/IPython/frontend/html/notebook/static/js/loginmain.js
@@ -14,7 +14,7 @@ $(document).ready(function () {
 
     IPython.page = new IPython.Page();
     $('input#login_submit').button();
-    $('div#main_app').addClass('border-box-sizing ui-widget');
+    $('#ipython-main-app').addClass('border-box-sizing ui-widget');
     IPython.page.show();
     $('input#password_input').focus();
 
diff --git a/IPython/frontend/html/notebook/static/js/logoutmain.js b/IPython/frontend/html/notebook/static/js/logoutmain.js
index 8bbddb4..16331d4 100644
--- a/IPython/frontend/html/notebook/static/js/logoutmain.js
+++ b/IPython/frontend/html/notebook/static/js/logoutmain.js
@@ -13,7 +13,7 @@
 $(document).ready(function () {
 
     IPython.page = new IPython.Page();
-    $('div#main_app').addClass('border-box-sizing ui-widget');
+    $('#ipython-main-app').addClass('border-box-sizing ui-widget');
     IPython.page.show();
 
 });
diff --git a/IPython/frontend/html/notebook/static/js/notebook.js b/IPython/frontend/html/notebook/static/js/notebook.js
index 78d22e3..43714d7 100644
--- a/IPython/frontend/html/notebook/static/js/notebook.js
+++ b/IPython/frontend/html/notebook/static/js/notebook.js
@@ -273,7 +273,7 @@ var IPython = (function (IPython) {
         });
 
         var collapse_time = function(time){
-            var app_height = $('div#main_app').height(); // content height
+            var app_height = $('#ipython-main-app').height(); // content height
             var splitter_height = $('div#pager_splitter').outerHeight(true);
             var new_height = app_height - splitter_height;
             that.element.animate({height : new_height + 'px'}, time);
@@ -285,7 +285,7 @@ var IPython = (function (IPython) {
         });
 
         var expand_time = function(time) {
-            var app_height = $('div#main_app').height(); // content height
+            var app_height = $('#ipython-main-app').height(); // content height
             var splitter_height = $('div#pager_splitter').outerHeight(true);
             var pager_height = $('div#pager').outerHeight(true);
             var new_height = app_height - pager_height - splitter_height;
diff --git a/IPython/frontend/html/notebook/static/js/notebookmain.js b/IPython/frontend/html/notebook/static/js/notebookmain.js
index e7221eb..5ef1c37 100644
--- a/IPython/frontend/html/notebook/static/js/notebookmain.js
+++ b/IPython/frontend/html/notebook/static/js/notebookmain.js
@@ -34,7 +34,7 @@ $(document).ready(function () {
     IPython.mathjaxutils.init();
 
     IPython.read_only = $('body').data('readOnly') === 'True';
-    $('div#main_app').addClass('border-box-sizing ui-widget');
+    $('#ipython-main-app').addClass('border-box-sizing ui-widget');
     $('div#notebook_panel').addClass('border-box-sizing ui-widget');
     // The header's bottom border is provided by the menu bar so we remove it.
     $('div#header').css('border-bottom-style','none');
diff --git a/IPython/frontend/html/notebook/static/js/printnotebookmain.js b/IPython/frontend/html/notebook/static/js/printnotebookmain.js
index 59a62b0..64895c2 100644
--- a/IPython/frontend/html/notebook/static/js/printnotebookmain.js
+++ b/IPython/frontend/html/notebook/static/js/printnotebookmain.js
@@ -15,7 +15,7 @@ $(document).ready(function () {
     IPython.mathjaxutils.init();
 
     IPython.read_only = $('body').data('readOnly') === 'True';
-    $('div#main_app').addClass('border-box-sizing ui-widget');
+    $('#ipython-main-app').addClass('border-box-sizing ui-widget');
     $('div#notebook_panel').addClass('border-box-sizing ui-widget');
 
     IPython.page = new IPython.Page();
diff --git a/IPython/frontend/html/notebook/static/js/projectdashboardmain.js b/IPython/frontend/html/notebook/static/js/projectdashboardmain.js
index b593302..c94d0a9 100644
--- a/IPython/frontend/html/notebook/static/js/projectdashboardmain.js
+++ b/IPython/frontend/html/notebook/static/js/projectdashboardmain.js
@@ -19,7 +19,7 @@ $(document).ready(function () {
         var new_url = $('body').data('baseProjectUrl') + '#' + ui.panel.id;
         window.history.replaceState({}, '', new_url);
     });
-    $('div#main_app').addClass('border-box-sizing ui-widget');
+    $('#ipython-main-app').addClass('border-box-sizing ui-widget');
     $('div#notebooks_toolbar').addClass('ui-widget ui-helper-clearfix');    
     $('#new_notebook').button().click(function (e) {
         window.open($('body').data('baseProjectUrl')+'new');
diff --git a/IPython/frontend/html/notebook/templates/login.html b/IPython/frontend/html/notebook/templates/login.html
index 22fb509..3722140 100644
--- a/IPython/frontend/html/notebook/templates/login.html
+++ b/IPython/frontend/html/notebook/templates/login.html
@@ -13,7 +13,7 @@
 
 {% block site %}
 
-<div id="main_app">
+<div id="ipython-main-app">
 
     {% if login_available %}
     <form action="{{base_project_url}}login?next={{next}}" method="post">
diff --git a/IPython/frontend/html/notebook/templates/logout.html b/IPython/frontend/html/notebook/templates/logout.html
index e074d89..e18730e 100644
--- a/IPython/frontend/html/notebook/templates/logout.html
+++ b/IPython/frontend/html/notebook/templates/logout.html
@@ -12,7 +12,7 @@
 
 {% block site %}
 
-<div id="main_app">
+<div id="ipython-main-app">
 
     {% if message %}
       {% for key in message %}
diff --git a/IPython/frontend/html/notebook/templates/notebook.html b/IPython/frontend/html/notebook/templates/notebook.html
index a9add88..a9a458f 100644
--- a/IPython/frontend/html/notebook/templates/notebook.html
+++ b/IPython/frontend/html/notebook/templates/notebook.html
@@ -161,7 +161,7 @@ data-notebook-id={{notebook_id}}
 
 <div id="maintoolbar"></div>
 
-<div id="main_app">
+<div id="ipython-main-app">
 
     <div id="notebook_panel">
         <div id="notebook"></div>
diff --git a/IPython/frontend/html/notebook/templates/printnotebook.html b/IPython/frontend/html/notebook/templates/printnotebook.html
index 083fd61..d7c9ff3 100644
--- a/IPython/frontend/html/notebook/templates/printnotebook.html
+++ b/IPython/frontend/html/notebook/templates/printnotebook.html
@@ -40,7 +40,7 @@ data-notebook-id={{notebook_id}}
 
 {% block site %}
 
-<div id="main_app">
+<div id="ipython-main-app">
 
     <div id="notebook_panel">
         <div id="notebook"></div>
diff --git a/IPython/frontend/html/notebook/templates/projectdashboard.html b/IPython/frontend/html/notebook/templates/projectdashboard.html
index 0c49f70..79d2122 100644
--- a/IPython/frontend/html/notebook/templates/projectdashboard.html
+++ b/IPython/frontend/html/notebook/templates/projectdashboard.html
@@ -20,7 +20,7 @@ data-read-only={{read_only}}
 
 {% block site %}
 
-<div id="main_app">
+<div id="ipython-main-app">
 
 <div id="tabs">
     <ul>