I'm having a for where I can create invoices. Now I'm having the form fields where I have to fill it out with the customer's data. Well I don't want to fill out existing customer's data everytime. So I am having a link which opens up a page with a list of all existing customers. Now how can I get it to auto complete the form fields when clicking on the customer in the popup page? In other words, when clicking on a customer in the popup page, the form fields have to be auto-completed in the parent page.