jquery blockUI tell if page or specific element is blocked

Is there a way to tell if $.blockUI(); has been called but $.unblockUI() has not been called? Ideally this should be able to work for both blocking the full page and specific elements.

I'd expect it to work something like this

> $.blockUI();
> $.isBlockUI?():
>> true
> $.unblockUI();
> $.isBlockUI?();
>> false

Look what I found here

  $(document).ready(function() { 
    $('#demo14').click(function() { 
        $.blockUI({ 
            fadeIn: 1000, 
            timeout:   2000, 
            onBlock: function() { 
                alert('Page is now blocked; fadeIn complete'); 
            } 
        }); 
    });

Evidently there's one for Block and unBlock sorta like a onSuccess function. So on the onBlock function you'd simply just set a global boolean value.

Hope this helps!

Happy Coding! ;)