Now I have been puzzling with this for some time.
I got part of it together in jquery/ajax:

```
<script type="text/javascript">
$(document).ready(function(){
    jQuery.ajax({
        type: "GET",
        url: "sessioncheck.php",
        dataType:"json",
        success:function(response){
            if (response) {
                window.location.href = 'logout.php';
            }
            else {
                // Process the expected results...
            }
        }

    });
});
</script>

```

This works perfectly, but I would like this process to repeat itself every 30 seconds.
Can someone please help me with that? I have read something about setinterval, but I cant seem to get it to work.

Thanks a lot in advance for all of your help!