OnPlayerSpeak
From the Scripting Manual
procedure OnPlayerSpeak(ID: Byte; Text: string);
NOTE: This event runs in a new thread! So using functions like
GetURL or Sleep will not cause the Server to freeze while
the function processes.
Parameter Info:
ID (Byte): Player ID of the person who just spoke.
Text (String): Self Explanitory.
Description:
This procedure will be called every time a player speaks.