[development] Insert users from script?

Hi all I have data for several persons in an excel file and i would like to convert all of these people in users in my drupal 6. Somebody knows how can i do this? The idea is that not to have to create the users one by one, maybe i would have to make an sql script to include the users in one time, but i don't know in which tables I have to include the data and some other things for example, how have i to set the password? (this is encrypted in the database field) thanks in advance Gastón Pablo Perez Email: gpperez@gmail.com Web: http://cv.gpperez.com.ar