What version of osCommerce are you running?

How do you know what version you are running? 

Look at Admin Tools Server Info

The results should tell you the version of osCommerce you are running.  It will also tell you what version of php and MySQL you are running. All handy things to know when you are shopping around for support.

Application Top

A quick look in application_top.php will tell you.  Look for
define(‘PROJECT_VERSION’, ‘osCommerce 2.2-MS2’);