Error of utilisation with phpMyAdmin

Hi everybody,
I'm using phpMyAdmin 2.2.6 with EasyPHP v.1.6.0.0
I wrote a php script which uses a username (added in the mysql base with
phpMyAdmin).
This user has no privileges.
But in the script, I have the following request for the same username :
INSERT TO table (...) VALUES (....)
And it's working !!! The user can insert new rows with the php script to
the database and
he has no privileges. How it can be possible ?
Maybe, I'm wrong ? Thank's for your help.

PS : I'm begining with php and mysql. I'm using windows XP. Excuse me for my
English.

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