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From: FAQ server on 3 Jul 2010 19:00
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FAQ Topic - How do I log-out a user when they leave my
site?
-----------------------------------------------------------------------

This cannot be done reliably. Here's why:

*
The user may disable javascript so the log-out script will
never execute.

*
The user may not be on-line when they close your web page.

*
Javascript errors elsewhere in the page may prevent the script
executing.

*
The browser may not support the onunload event, or may not fire
it under certain circumstances, so the log-out function will
not execute.

The URL below has more information.

http://groups.google.com/groups?selm=BlmZ7.55691%244x4.7344316%40news2-win.server.ntlworld.com


The complete comp.lang.javascript FAQ is at
http://jibbering.com/faq/

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