notification bar context script/page

src/content/notificationBar.js

@@ -0,0 +1,44 @@
+!(function () {
+    chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) {
+        if (msg.command === 'openNotificationBar') {
+            closeBar();
+            openBar();
+            sendResponse();
+            return true;
+        }
+        else if (msg.command === 'closeNotificationBar') {
+            closeBar();
+            sendResponse();
+            return true;
+        }
+    });
+
+    function openBar() {
+        var iframe = document.createElement('iframe');
+        iframe.src = chrome.extension.getURL('notification/bar.html');
+        iframe.style.cssText = 'height: 41px; width: 100%; border: 0;';
+
+        var frameDiv = document.createElement('div');
+        frameDiv.id = 'bit-notification-bar';
+        frameDiv.style.cssText = 'height: 41px; width: 100%; top: 0; left: 0; padding: 0; position: fixed; z-index: 1000000099; visibility: visible;';
+        frameDiv.appendChild(iframe);
+        document.body.appendChild(frameDiv);
+
+        var spacer = document.createElement('div');
+        spacer.id = 'bit-notification-bar-spacer';
+        spacer.style.cssText = 'height: 41px;';
+        document.body.insertBefore(spacer, document.body.firstChild);
+    }
+
+    function closeBar() {
+        var el = document.getElementById('bit-notification-bar');
+        if (el) {
+            el.parentElement.removeChild(el);
+        }
+
+        el = document.getElementById('bit-notification-bar-spacer');
+        if (el) {
+            el.parentElement.removeChild(el);
+        }
+    }
+})();