add topbar dropdown js

examples/assets/css/bootstrap-js.css

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+body {
+  padding-bottom: 60px;
+}
+/* Topbar special styles
+-------------------------------------------------- */
+div.topbar-wrapper {
+  position: relative;
+  height: 40px;
+  margin: 5px 0 15px;
+}
+div.topbar-wrapper div.topbar {
+  position: absolute;
+  margin: 0 -20px;
+}
+
+div.topbar-wrapper div.topbar .fill {
+  padding-left: 20px;
+  padding-right: 20px;
+  -webkit-border-radius: 4px;
+     -moz-border-radius: 4px;
+          border-radius: 4px;
+}
+
+div.topbar-wrapper .container {
+  width: auto;
+}
+
+/* Pretty Print
+-------------------------------------------------- */
+PRE.prettyprint {
+  overflow: hidden;
+}
+
+section {
+  padding-top: 60px;
+}

examples/assets/js/bootstrap-dropdown.js

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+(function( $ ){
+
+ /* DROPDOWN PLUGIN DEFINITION
+  * ========================== */
+
+  function clearMenus() {
+    $('a.menu').parent('li').removeClass('open')
+  }
+
+  $(window).bind("click", clearMenus)
+
+  $.fn.dropdown = function ( options ) {
+    return this.each(function () {
+      $(this).delegate('a.menu', 'click', function (e) {
+        clearMenus()
+        $(this).parent('li').toggleClass('open')
+        return false
+      })
+    })
+  }
+
+})( jQuery || ender )