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+// leave at least 2 line with only a star on it below, or doc generation fails
+/**
+ *
+ *
+ * Placeholder for custom user javascript
+ * mainly to be overridden in profile/static/custom/custom.js
+ * This will always be an empty file in IPython
+ *
+ * User could add any javascript in the `profile/static/custom/custom.js` file
+ * (and should create it if it does not exist).
+ * It will be executed by the ipython notebook at load time.
+ *
+ * Same thing with `profile/static/custom/custom.css` to inject custom css into the notebook.
+ *
+ * Example :
+ *
+ * Create a custom button in toolbar that execute `%qtconsole` in kernel
+ * and hence open a qtconsole attached to the same kernel as the current notebook
+ *
+ *    $([IPython.events]).on('app_initialized.NotebookApp', function(){
+ *        IPython.toolbar.add_buttons_group([
+ *            {
+ *                 'label'   : 'run qtconsole',
+ *                 'icon'    : 'icon-terminal', // select your icon from http://fortawesome.github.io/Font-Awesome/icons
+ *                 'callback': function () {
+ *                     IPython.notebook.kernel.execute('%qtconsole')
+ *                 }
+ *            }
+ *            // add more button here if needed.
+ *            ]);
+ *    });
+ *
+ * Example :
+ *
+ *  Use `jQuery.getScript(url [, success(script, textStatus, jqXHR)] );`
+ *  to load custom script into the notebook.
+ *
+ *    // to load the metadata ui extension example.
+ *    $.getScript('/static/notebook/js/celltoolbarpresets/example.js');
+ *    // or
+ *    // to load the metadata ui extension to control slideshow mode / reveal js for nbconvert
+ *    $.getScript('/static/notebook/js/celltoolbarpresets/slideshow.js');
+ *
+ *
+ * @module IPython
+ * @namespace IPython
+ * @class customjs
+ * @static
+ */
+
+$([IPython.events]).on('notebook_loaded.Notebook', function(){
+    /* first, checks if it isn't implemented yet */
+    if (!String.prototype.format) {
+      String.prototype.format = function() {
+        var args = arguments;
+        return this.replace(/{(\d+)}/g, function(match, number) { 
+          return typeof args[number] != 'undefined'
+            ? args[number]
+            : match
+          ;
+        });
+      };
+    }
+
+    $code_cell = $(".code_cell");
+
+    var regex = /[+-]?\d*\.*\d+/g;
+    var path_regex = /\/([^\/]*)\/[^/]*\.ipynb$/;
+    var count = 1;
+
+    /* fetching book name from path */
+    var pathname = window.location.pathname;
+    var strings = pathname.match(path_regex);
+    var book = strings[1];
+    console.log("Book:" + book);
+
+    /* fetching chapter number */
+    var $first_text_cell = $(".text_cell:first");
+    var chapter_name = $first_text_cell.find("h1").attr("id");
+    var numbers = chapter_name.match(regex).map(function(v) { return parseFloat(v); });
+    var chapter_number = Math.abs(numbers[0]);
+    console.log("Chapter:" + chapter_number);
+
+    $code_cell.each(function(index, element) {
+        /* fetching example and page number */
+        var $current_text_cell = $(this).prev();
+        var $heading = $current_text_cell.find("h2");
+        var heading_text = $heading.html();
+        var numbers = heading_text.match(regex).map(function(v) { return parseFloat(v); });
+        var example_no = Math.abs(numbers[0]);
+        var page_no = Math.abs(numbers[1]);
+        console.log("Exp:" + example_no + ", Pg:" + page_no);
+        
+        /* creating the link */
+        var $link = $("<a>?</a>");
+        href = "http://example.com/?book={0}&chapter={1}&example={2}&page={3}";
+        href = href.format(book, chapter_number, example_no, page_no);
+        $link.attr({
+            href: href,
+            target: "_blank",
+            class: "question"
+        });
+        $(this).prepend($link);
+        count++;
+    });
+});