> How about a hidden form field that gets populated with the 
> current date/time on form submission?  Then you could parse 
> it and compare it to Now() on your action/upload page.

There are two minor caveats to this approach. First, you don't know how long
the user will spend on the form before submitting. Second, you don't know
how long it took for the user to receive the form after it was generated. To
avoid both of these problems (to the extent that you care about them) you'd
have to set the value of the hidden form field at the time it's submitted
using JavaScript, and you'd have to account for the time difference if any
between the client and the server.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized
instruction at our training centers in Washington DC, Atlanta,
Chicago, Baltimore, Northern Virginia, or on-site at your location.
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