Group Chat

How do i make it so instead of when you type using “u” it says “group” instead it says “radio”?

I have a few examples ( using OnPlayerChat ):
https://dl.dropboxusercontent.com/u/26074909/tutoring/chat_tags/chat_tags_example.lua.html

https://dl.dropboxusercontent.com/u/26074909/tutoring/chat_tags/simple_chat_tags_example_using_init_table.lua.html

https://dl.dropboxusercontent.com/u/26074909/tutoring/chat_tags/simple_chat_tags_example_using_table_insert.lua.html

[ NOTE ] Remove .html to view / copy .Lua …