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WHOO! Figured it out!

<input type='button' onclick='send_invite(this.value)' value='test'/>
Actually, I did

<div class="whatever" onclick="send_invite(this.title)" title="42">better...

http://www.w3schools.com/ajax/default.asp

The tutorials on that site are amazing.

(this is my first post; I'm inexperienced in both ajax and javascript (but learning!), so I'm sorry if I screwed anything up and if you need more/less info, let me know; thanks!)

Ok, so I'm trying...