osCommerce - Delivery search

I have a website built using osCommerce and currently only deliver to certain postcodes. I need to allow users to search their postcode to check if delivery is available. This search needs to be shown on the product page and also show results in the same format as can be seen on [login to view URL] It would be preferred if you use AJAX to complete this project to eliminate additional page loads. When searching the user must be able to search using either postcode or suburb, and autocomplete must be populated from the database. An image has been attached showing the area I wish to duplicate from the above link. Please ensure you check both the URL, the search form, and the image. The postcodes are all listed in the database. Some postcodes are linked to multiple suburbs. This needs to be taken into account when completing the project. EG: Postcode: 4157 Suburbs: Sheldon, Capalaba West, Capalaba, Capalaba BC, Capalaba DC A screenshot of the database search has been included.