Australian store locator PHP web page

We need a web page developed in PHP that will: 1. Allow a user to type in either a Suburb or Postcode in Australia 2. Find and display the closest store location to the entered suburb/postcode The solution will use AJAX to provide a dropdown list of suburb/postcodes as the user is typing each letter, For example the user starts typing "Wan", the solution will drop a list containing the first 15 matching suburbs: "Wanaaring NSW 2840" "Wanalta VIC 3612" "Wanarn NT 0872" "Wanbi SA 5310" "Wandal QLD 4700" etc... or, the user starts to enter a post code "601" the solution will drop a list containing the first 10 matching suburbs "Churchlands WA 6018" "City Beach WA 6015" "Claremont WA 6010" (Example site see [login to view URL]) Once the user selects a surburb/postcode and presses enter the page will display the closest store.