Causes of javascript timeout error

0. usage of setTimeout and setInterval/clearTimeout and clearInterval

"Javascript Tutorial - Using setInterval and setTimeout"
http://www.switchonthecode.com/tutorials/javascript-tutorial-using-setinterval-and-settimeout

"... passing an actual function reference instead of a string, we get the added benefit of maintaining the scope of the function (instead of the assumption of global scope).
...
"



1. "Session Timeout Error in Ajax Applications"
http://www.openjs.com/articles/ajax/session_timeout.php

2. "... An AJAX request made from a timed-out session will throw a 500 error..."
www.nabble.com/An-AJAX-request-made-from-a-timed-out-session-will-throw-a-500-error-td18069903.html

*** 3. "Prevent session timeout in your ASP.NET AJAX application"
http://www.webdoubt.com/5/a-session-keep-alive-timer-for-ajaxnet-applications/
"... wonder if the worker processes are being recycled for some reason..."