how obtain last id past insert?

["Webmaster D.G.R.E.R." <webmaster_dgr@xxxxxxxxxxxxxxxx>]

Hi:
    How i obtain inmediatly the id of last insert ?
    For example i have a forum, when the user post a question, i send a mail
to administrator, but i want to refer the id from this insert, how i do this
?
    Well i think to make a select max(id) inmediatly but i beliebe that must
have any colision from other user that post other question.
    Thank you.

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