you want it to lock the user out when the browser hasn’t had focus after 15 minutes? Well that’s easy you think, I’ll just connect to the document’s blur and focus events and be good to go.

msie6 quirkiness

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nick hack.

the alternative fix for IE6's memory leak is available

try finally does the job for you.

JavaScript Memory Leak Detector is a debugging tool to detect memory leaks in JavaScript code. It can be installed as an Internet Explorer band and it is expressly designed to find memory leaks in JavaScript code that runs in Internet Explorer.