Disabling back option after logout

Place this code in your javascript to disable the back action of your browser

<script type="text/javascript">
        function noBack()
         {
             window.history.forward()
         }
        noBack();
        window.onload = noBack;
        window.onpageshow = function(evt) { if (evt.persisted) noBack() }
        window.onunload = function() { void (0) }
    </script>