getting the auto_inc id of the mysql insert

[eluser]Fenix[/eluser]
I am trying to insert blog entry-type data into a database but I keep the tags in a separate table. The post table has an auto incremented id field which needs to also be the the value of a field in the tags table. I saw there was a way to do this a while ago but I can't remember where I found it. Any help is appreciated, thank you!

[eluser]Mirage[/eluser]

Code:

$this->db->insert_id()

Hint: The user guide contains a wealth of info. mirk:

Cheers,
-m