diff --git a/html5/verto/video_demo/js/getScreenId.js b/html5/verto/video_demo/js/getScreenId.js
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+++ b/html5/verto/video_demo/js/getScreenId.js
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+// Last time updated at Sep 07, 2014, 08:32:23
+
+// Latest file can be found here: https://cdn.webrtc-experiment.com/getScreenId.js
+
+// Muaz Khan         - www.MuazKhan.com
+// MIT License       - www.WebRTC-Experiment.com/licence
+// Documentation     - https://github.com/muaz-khan/WebRTC-Experiment/tree/master/getScreenId.js
+
+// ______________
+// getScreenId.js
+
+/*
+getScreenId(function (error, sourceId, screen_constraints) {
+    // error    == null || 'permission-denied' || 'not-installed' || 'installed-disabled' || 'not-chrome'
+    // sourceId == null || 'string' || 'firefox'
+    
+    if(sourceId == 'firefox') {
+        navigator.mozGetUserMedia(screen_constraints, onSuccess, onFailure);
+    }
+    else navigator.webkitGetUserMedia(screen_constraints, onSuccess, onFailure);
+});
+*/
+
+(function() {
+    window.getScreenId = function(callback) {
+        // for Firefox:
+        // sourceId == 'firefox'
+        // screen_constraints = {...}
+        if (!!navigator.mozGetUserMedia) {
+            callback(null, 'firefox', {
+                video: {
+                    mozMediaSource: 'window',
+                    mediaSource: 'window'
+                }
+            });
+            return;
+        }
+
+        postMessage();
+
+        window.addEventListener('message', onIFrameCallback);
+
+        function onIFrameCallback(event) {
+            if (!event.data) return;
+
+            if (event.data.chromeMediaSourceId) {
+                if (event.data.chromeMediaSourceId === 'PermissionDeniedError') {
+                    callback('permission-denied');
+                } else callback(null, event.data.chromeMediaSourceId, getScreenConstraints(null, event.data.chromeMediaSourceId));
+            }
+
+            if (event.data.chromeExtensionStatus) {
+                callback(event.data.chromeExtensionStatus, null, getScreenConstraints(event.data.chromeExtensionStatus));
+            }
+
+            // this event listener is no more needed
+            window.removeEventListener('message', onIFrameCallback);
+        }
+    };
+
+    function getScreenConstraints(error, sourceId) {
+        var screen_constraints = {
+            audio: false,
+            video: {
+                mandatory: {
+                    chromeMediaSource: error ? 'screen' : 'desktop',
+                    maxWidth: window.screen.width > 1920 ? window.screen.width : 1920,
+                    maxHeight: window.screen.height > 1080 ? window.screen.height : 1080
+                },
+                optional: []
+            }
+        };
+
+        if (sourceId) {
+            screen_constraints.video.mandatory.chromeMediaSourceId = sourceId;
+        }
+
+        return screen_constraints;
+    }
+
+    function postMessage() {
+        if (!iframe.isLoaded) {
+            setTimeout(postMessage, 100);
+            return;
+        }
+
+        iframe.contentWindow.postMessage({
+            captureSourceId: true
+        }, '*');
+    }
+
+    var iframe = document.createElement('iframe');
+    iframe.onload = function() {
+        iframe.isLoaded = true;
+    };
+    iframe.src = 'https://www.webrtc-experiment.com/getSourceId/';
+    iframe.style.display = 'none';
+    (document.body || document.documentElement).appendChild(iframe);
+})();