howWhether a user is searching, adding a new entry, or updating an existing contact you should verify that they have entered a value in each field. If the have not, then you should indicate this to them via serverside scripting. When an entry has been successfully saved or updated then you should tell the user. If a search, save, or update was not successful then you should indicate this to the user. You should also alert the user if the text file containing the contacts does not exist.