5 minute Auto-Lock not engaging on certain webpages

Hi Apple Support Forums,
I have been testing iPads in our organisation for a few weeks now, and one of our iPad users discovered a fairly major bug in iOS 4.2
If:
(Mobile)Safari is left open with either: adelaidenow.com.au or theaustralian.com.au (and possibly other News Corporation newspaper sites, but not news.com.au)
Auto-Lock is set to 5 minutes (as per our organisations MobileConfig passcode settings)
iPhones and iPads will not lock. The screen will not even dim, even after the auto-lock time has expended.
This was discovered when one of our users left adelaidenow.com.au running on an iPad on a table and left it to answer a phonecall. The device had not locked after their phone call.
Procedure to reproduce:
I opened Safari on the iPad and accessed adelaidenow.com.au. I let the page load (while providing input, moving finger) and then stopped interacting with the ipad. (left idle).
I set up a stopwatch and verified that after 7 minutes it had not locked.
The device had been idle for 7 minutes without input and had not already locked.
To verify that it was not Safari (the app, not the web page) that was not preventing lock, I loaded au.yahoo.com (while providing input) and then left it idle.
After 5 minutes the screen locked. (as expected)
I then loaded www.theaustralian.com.au and left it idle.
I step a stopwatch going and after 6 minutes it had not locked.
I tested this against http://au.yahoo.com and http://abc.net.au/news and the iPad/iPhone will lock as expected.
I believe that cause for this is that newsCorp is using a custom refresh script in javascript, rather than a standard META REFRESH tag. Somehow this javascript is fooling iOS into thinking that the device is not idle.
This is a fairly major security hole, as the device is violating a locked-down MobileConfig.
Could others test this and find any other sites that prevent iOS from auto-locking?

Do you see the images in Tools > Page Info > Media ?
Try to disable IPv6 in Firefox, see http://kb.mozillazine.org/Error_loading_websites#IPv6
See also http://kb.mozillazine.org/Error_loading_websites (Error_loading_some_websites)
You can also try "Reset all user preferences to Firefox defaults" on the [[Safe mode]] start window - See http://kb.mozillazine.org/Resetting_preferences
See also [[Images or animations do not show]] and http://kb.mozillazine.org/Images_or_animations_do_not_load

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