diff --git a/simplewiki_edit.html b/simplewiki_edit.html
index 0fb28f8d6e..e0bffd5f31 100644
--- a/simplewiki_edit.html
+++ b/simplewiki_edit.html
@@ -11,16 +11,15 @@ ${ wiki_article.title }
 <%block name="wiki_head">
 <script>
   $(function() {
-    $("#id_contents").data('initial_contents') = $("#id_contents");
+    //Store the initial contents of #id_contents (the wiki body field) so we can compare for unsaved changes
+    $("#id_contents").data('initial_contents', $("#id_contents").val());
     
-    
-    window.
-    
-  }
-
-  //On load, we save
-  
-  var blah;
+    window.onbeforeunload = function askConfirm() { //Warn the user before they navigate away
+      if ( $("#id_contents").val() != $("#id_contents").data('initial_contents') ) {
+        return "You have made changes to the article that have not been saved yet.";
+      }
+    };
+  });
 </script>
 </%block>