Show online counter for users

I'm using the whos.amung.us on my website. But it not work!
I'm looking for alternative and I found Clicky.

But the widget is only avaible for me, not for all users of website. Is possible set to 'public', but, only the Online Counter?

I think I will use the API to create a box, similiar to Clicky widget, and on click open the Clicky Stats. :S