Users listing in chat box widget

I have a pop up Chat Box widget and would like to show the users on line at the bottom of the widget.
I found the code used on the bottom of the index page but can't figure out how to get it to work in the widget.
Here's the code I found in the template for the home page

Code:

<span class="gensmall">{TOTAL_CHATTERS_ONLINE}&nbsp;:&nbsp; {CHATTERS_LIST}<br />

I'm using phpbb2
If any of the code wizards here can help me out, I'd really appreciate it. Thanks in advance...

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