I've used the example HTML for 'self-hosted Instant Chat' in the Administration Center. Our website is a DotNetNuke website and this HTML needs to be inside an iFrame (well that is how I got it working). Clicking the button displays the Chat control both within the existing iFrame and in a popup window.
Can we stop the popup window? To see it happen, click 'Request Live Chat' on our website page:
http://www.2icsoftware.com/Support/LiveSupport/tabid/146/Default.aspx
There is no popup window when using the original 'form' HTML and invoking the chat control from the Administration Center settings. However we prefer separate buttons for chat and remote control. This allows the remote control session to have the original separate chat window that is not embedded in a web page. When it is embedded it does not flash in the Windows task bar for new messages and the session is more likely to be cut off by refreshing the web page or navigating away from it.
Back to my original question, hopefully there is a simple solution. Don't expect I've tried it already because I'm an amateur when it comes to HTML and websites in general.