After logged out, clicking browser go back button still brings back the previous visited page
drupal_add_http_header('Cache-Control', 'no-cache, no-store, max-age=0, must-revalidate, post-check=0, pre-check=0');
?>
Work offline page open through history page
<script type="text/javascript">
jQuery(document).ready(function() {
var a=navigator.onLine;
if(a){
//alert('online');
}else{
alert('offline');
window.location='index.php';
}
})
</script>
