As others have answered, you can't set a cookie with a different domain. That is a good thing.

But, since you control both domains, you can redirect the browser to a URL in the other domain which then sets an identical cookie. If you need to keep the cookies in sync, it's a pain, but if the cookie doesn't change once it is set (e.g. just holds an ID) it's workable.

Good luck!

-sauoq
"My two cents aren't worth a dime.";