You'll have to find an alternative. Setting cookies for other domains would be a huge problem. Imagine a malicious programmer writing a script that would overwrite your cookies for any domain they wish. I'm sure that you can think of plenty of scenarious where this would be disastrous. For example, imagine someone changing your Web-based email account cookie so that you log into a spammer's account. Think of the new dimensions of spam that would be created ...

Cheers,
Ovid

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