problem with associating checkbox in perl-cgi

[vpcs]

I am trying to do an invoicing software with perl - cgi. I am having
a problem in associating the checkbox with the items from the
database.

I am giving the user option to enter the customer name. The invoices
pertaining to the customers is displayed with the check box. Once the
user checks the particular check box the status of the particular
check box ie. the particular invoice field should be updated to PAID.
I got stuck up in associating the check box with the particular field
in the database. Can anyone help me in this.

Thanks in advance
Sam