JQUERY - MODAL FORM - LOGIN AUTHENTICATION

JQUERY - MODAL FORM - LOGIN AUTHENTICATION

Dear All

Can some one please help , what i want to do is when some one enter Name , Email , Password and Hit Button " Create an Account " . It should go to mysql database and check if Name , Email , Password is present . If it is present then it should allow the person , if not then it should give a error invalid NAME OR Password

http://jqueryui.com/demos/dialog/#modal-form

Please help