possible mysql_insert_id() conflicts ?

hi, Imagine the following php+mysql scenario: there are two tables: create table testuser(id int not null auto_increment, name varchar(255), primary key(id)); create table testaddress(id int not null auto_increment, user int not null,street varchar(255), primary key(id)); the *.php test script contains the following lines: mysql_query("insert into testuser (name) ('testname')"); //<--* (see below) $userid = mysql_insert_id(); mysql_query("insert into testaddress(user,street) values('$userid','teststreet')"); * at this time another thread could insert another record into testuser and the logical question: Will I get the right $userid from mysql_insert_id() anyway ?? thanx - rené