WP-IRIS is a WordPress plugin which will allow you to embed the IRIS IRC client on any page or post by using a simple shortcode.
Download WP-IRIS
You can find WP-IRIS on my GitHub, but to install simple cd into your WordPress plugins directory and then run the following command (make sure git is installed before doing this):

git clone https://github.com/xnite/wp-iris.git
Example:

Shortcode Arguments

width
The width of your embedded client (Default: 95%)

height
The height of your embedded client (Default: 450px)

clientpath
The path to your IRIS client (Default: http://irc-source.com:8080′,

nickprefix
The default nickname prefix (Default: WP-IRIS_)

channel
The IRC channel that the user will be joined to, without the leading #. (Default: lobby)

prompt
Whether or not to prompt the user for nickname, channel, etc. before connecting. (0 = No, 1 = Yes, Default: 1)

fgca
Foreground Color A (Default: 000000)

fgcb
Foreground Color B (Default: 888888)

bgc
Background Color (Default: ffffff)

Demo