First make a file "config.mysite.php":
$config["defaultAccount"] = "123";
$config["uploadPath"] = "/var/uploads";
$config["adminUserID"] = "ADMN";
.... and so on.
Then, in your standardheader.php, include the following line:
require("config.mysite.php");
Now you can access the $config array. If you want to see this in action, download the PhpMyAdmin project and look at how they handle it.