Modify adminer script - add configuration file

Google the script "adminer" - its a great tool for working with clients who got database type sites. I use it over PHPMyAdmin because I can upload a single file via php and be working on their DB in seconds vs going through a control panel. Anyhow... The script currently requires that you enter credentials each time you access it. I need to change that and I'd like to be able to edit a config file and then not have to enter the host name, user and password each time. I'll use htaccess to protect the script from outside access. This should be a simple project. When you download adminer please remember I'm using the PHP version.