insert in function writen in pgplsql

Hello

lets say I have a function add_user(user varchar(20), password
varchar(20)). In its body I want to have statement INSERT INTO
my_users(user, password) VALUES (user, password); The problem is I cant
- then I try to create such function I get "ERROR:  syntax error at or
near "$1"
LINE 1: INSERT INTO my_users(  $1 .... " This tells me the parameter is
used instead of column name. That is of course not what I wanted. What
would you recommend to fix this? Is there any way to tell the postgres
that user is column name? I tried "user" with same error. Must I change
the names of parameters?

using PG 8.3

--
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050