HELP migrating php db between domains

I have redesigned a site that was done by the previous webmaster in php with a database. I have managed not to screw it up, but now have to move the site to a new domain name, and can't find the db to move. Need to either: 1. point the new website to the old IP address and server 2. find the db information and move it to the new server Here is the script I have narrowed it to: define("HOSTSERVER", "localhost" ); // the name of your database host server - you can ask your isp what this value should be - modify but I need to replace localhost with something - I tried the old IP address - no go. Any help?? I am running out of time on my existing domain before it expires and the data will be lost. Teresa Gamble Hamilton On