The issues involved with generating random IDs have been discussed multiple times on this site. Check out Randomizing Unique ID?, which is one of the more long winded threads. (My particular solution was RE: RE: RE: Randomizing Unique ID? but you should really read the whole thread.)

In reply to RE: RE: Re: Saving State w/o Cookies by Adam
in thread Saving State w/o Cookies by motomuse

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