ajax - session timeout weirdness -

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i have main site people log-in. iis , standard session time out of 20 minutes.

there live chat facility appears in popup window in same domain. there's no https involved.

despite fact chat window makes ajax calls server every few seconds (and @ least 1 piece of data back) sends data server via ajax whenever logged-in user posts message timed out after 20 minutes if nothing happening.

any ideas why should happen , how stop it's irrational logged out f site while actively communicating server.

what i've decided use cookie rather site's session variable check if they're logged in. chat app, hour when first open chat page.
, every time post message gets reset hour later.

that way posters stay logged in , lurkers bumped off.

on load:

response.cookies("chatuser")=nickname response.cookies("chatuser").expires=now()+0.5

on post message:

response.cookies("chatuser").expires=now()+0.5

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