How to autoupdate a forum thread when new posts?

Question

Greasemonkey plugin. (js/ajax, jquery optional).

• Want to autoupdate forum pages when they get changed (new posts, for instance). Ideally with no page refresh.<

Answer 1

loop GM_xmlhttpRequest to get the forum page in a 15 minutes interval.
save the response, and compare with the last one.
keep only the content that was added, and display it any way you see fit (i would use a div).

in this example here you can see how to use GM_xmlhttpRequest, create a DIV on the fly, store the desired content into it, and use its data as a parameter to request another page with GM_xmlhttpRequest again, repeating the cycle.

if you want me to explain the script, let me know.