AJAX/CSS Quick data entry

I need an ajax/css script that will allow me to add users. When the user clicks the "add user", I want the main page to "dim" and a popup window that allows the data entry for the new user. The script should validate the form by ensuring certain fields aren't empty/blank. Below is a create table script for the table that will be populated... `client_nm` varchar(50) character set latin1 NOT NULL, `client_no` decimal(6,0) NOT NULL, `audit_year` decimal(4,0) NOT NULL, `audit_no` varchar(12) character set latin1 NOT NULL, `active` enum('Y','N') character set latin1 NOT NULL default 'Y', `prefix` varchar(10) character set latin1 NOT NULL, `suffix` varchar(10) character set latin1 NOT NULL, `email_address` varchar(40) character set latin1 NOT NULL default 'scadreau@[login to view URL]', `image_path` varchar(200) character set latin1 NOT NULL default 'claims/', `data_path` varchar(200) character set latin1 NOT NULL default 'data/',