jQuery 1.4.x or later is required.

Steps:

• Load reqman.js
• Optionally, set a callback to execute before or after adding/removing a request(see the docs)
• Wrap every AJAX request with the add() function, like this: RQ.add($.get(....),"optional_id")
• Then, if you wanna kill all pending requests, just execute RQ.killAll()
• Or kill a single request with RQ.kill("optional_id") or RQ.killByRegex(regex)

That's all folks! (The docs contain more details!)