timeout problem

[neginf]

I have a Javascript timout function that increments a value in a cookie by 1every 10 seconds. When any page is requested, the cookie value goes back to 0. If no page gets requested and the cookie value goes to 180 (1/2 hour), all the frames are blanked out except for 1 where you can log back in. It works but on one of the user machines, it doesn't. It never times out.

What can be causing this ?
Can a browser setting be causing it ?
If so, what setting ?

Thank you very much.

[WolfShade]

Is there anything obviously different about that one computer (different browser, etc.)?

Have you checked for JavaScript error messages? Use FireFox Error Console in addition to FireBug.

^_^