Mister Vorhees

Hi, I'm pretty new to LSL, but I've been getting a good hang of things. Could anyone possibly give me a hint on how to keep HTTP Request Data unique? EX: I have a textbox users can submit a message to. This message will be sent out VIA Post along with character name. My issue is when resident A clicks the box and is typing a message, if another Resident B clicks the box when A hit's Submit it will contain B's Username