Add autofill text field on an ASP Classic page

Have ASP Classic web page that we want to have an autofill text box in the form. It will do a query of all agents ordered by name and they user can start entering the name and pops up list and then select just the search box on the top of page - https://www.mnrealestateteamvendors.com/

Developer will get the current existing page and add the autofill capability and return to me. Access to server not possible.