AJAX Select Box help

I have a form that requires the user to select a date and a time from two different select boxes. The values for each select box are stored in a database. These tables exist and are populated. The time values vary be date, and I need the times to adjust immediately based upon which date the user selects - without a page refresh. ## Deliverables I am unable to provide direct access to my development environment, but I can provide files depicting the database tables, and the code for the queries I require. I require a quick turnaround time, as I assume this project is quite straightforward for someone with the proper skills.