Check out the previous discussion on cookie check. The general pattern is:

1. Try to set the cookie.
2. Redirect to your current script, passing a parameter indicating that you have attempted to set the cookie.
3. Have an if-then in your script watch for the presence of this parameter. If it's set and there is no cookie, then the client has cookies turned off.

Don't forget, though, that since clients can approve or disapprove of cookies individually, the fact that they allow one cookie to be set doesn't mean that they'll allow others.

stephen