Check internet connection using script

See more:

Javascript

<script type="text/javascript">
   function checkconnection() {
   var status = navigator.onLine;
   if (status) {
   <script src="https://www.google.com/jsapi"></script>
   } else {
   <script src="Script/barchat.js"></script>
   }
   }
   </script>

If internet connection status is true means we call "https://www.google.com/jsapi" .
If connection status is false we call "barchat.js".

This script is correct or not..

Please Help me