http://sourceforge.net/projects/jisirc/ is exactly what I need, only problem is it has multiple ActiveX dependencies and that will not do. Does anyone know of any similar projects which are more portable?
You will have to have dependencies to an external application in order to open a socket towards the IRC server.
It can be dependent on the browser architecture (ActiveX controls, Mozilla based, ...)
Dependent on a java applet (in this case the irc server should be run on the same host the javascript originates from (unless you go towards signed applets))
The "real" IRC client is running on server-side, and the script is only used to communicate with that client.
In DmitryK's list you will find an example for each.