Freenode IRC chat in MyBB

Just a simple script to add IRC chat to your MyBB forum. You will need to upload this code as a new PHP file to the same directory as your MyBB install (with global.php). Then, just use a borderless iframe to add it to your theme. Copy-pasting this code into your MyBB theme will not work as PHP execution is disabled, for it is a major security hole to do so.