What would allow me to add this functionality to my website? Is it mySQL database? is it PHP? javascript?
I want something similar to the freelancer website called fiverr, to name one as example. You can login as a member and write messages to the inbox of the site owner. If they are present, they can chat in real time, with the "squiggly animated pencil" moving as both parties type. And if one of them is away, they can still leave a message.
