database insert question

[eluser]TheoR74[/eluser]
Hello, this may be a pretty stuppid question, but here goes....

I have a mysql table with an id field int 11 auto increment.

I want to use the $this->db->insert('table_name') function, but I need to know the number that is put into the id field. Is there any easy way to find that out?

Thanks
Theo