Importing CSV data

Hi there everyone, I have a database with email addresses from people who sign up for a newsletter on my website. Now, I have a utility i've written where they can save the addresses as a CSV file on their computer if they are logged in and the admin. What I would love to know, is how can I reserve this? What I mean is, if there is a CSV file with a single field (EMail) i'd like to be able to insert the data into the database from a file which would be selected from the admins computers. I can select a file from the computer no problem, what i'm not sure how to do is to go through the CSV file, and import the EMail addresses into a record of their own (IE: id1,id2,id3 rather than all in 1 row)). Any help / code tips would be REALLY appreciated :-) Regards Chris