Blab has code built in for this but I thought to create my own for more versatility site design wise. I eventually settled for the code below which I displayed in an iframe ...
(click to enlarge in a new window)
Direct link to code here
New Window link to code here
As you can see the page refreshes every 15 seconds. By using an iframe the an auto-refreshing display of the chat users can be displayed on any page. I have used the above in a different file to alter the colour of the text to display it in 2 locations to suit the site design. Iframe code ...
iframe src="file-location-here" width="150px" height="15px" scrolling="no" style="border: 0px;"
You can see this working in 2 places - the very top of the site and on the chat page itself.