Every now and again you run into silly (but useful) sites with silly (and useless) session timeouts with no means of changing them. So you do something else while working with the sites only to come back and find out you've been logged out.

Well, here's a little script to help with this situation:

property reloadInterval : 120
property reloadUrls : {"gsx", "mac.com"}

on idle
	tell application "System Events"
		if (application "Safari" is not frontmost) then
			tell application "Safari"
				repeat with anUrl in reloadUrls
					repeat with theDoc in (every document whose URL contains anUrl)
						do JavaScript "window.location = window.location" in theDoc
					end repeat
				end repeat
			end tell
		end if
		return reloadInterval
	end tell
end idle

Just set your preferred interval in seconds. This hack is particularly nice IMHO in that it even lets you set a list of partial URLs the pages to be reloaded should contain. Also, it checks System Events to make sure we're not actually in Safari. Just don't forget to switch to another app for this to work. ;)

Oh, and the on idle stuff only works if you save it as an application and check “Stay Open”.