auto refresh web page so no timeout session happen

ecrater.com will timeout for certain amount of time, relogin required if this happened.
Besides time wasted, it might also create item entry double create.
From googling, it seems like Javascript programming need.
Allstocks.com Auto Refreshing Program this prog seems only works with IE, dont know how to make it compatible with other browser, like firefox or chrome.
http://webtips.dan.info/refresh.html
http://zeeshanumardotnet.blogspot.com/2010/11/how-to-keep-session-alive-in-aspnet.html
http://zeeshanumardotnet.blogspot.com/2009/08/how-to-auto-refresh-re-load-page.html
http://forums.asp.net/t/1664483.aspx
http://www.quackit.com/javascript/javascript_refresh_page.cfm
http://asp.net.bigresource.com/Auto-Session-Logout-and-Redirect-to-Login-Page--o2V57J7vu.html#ipDZ9L8kX
http://grizzlyweb.com/webmaster/javascripts/refresh.asp
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