Hello,
It looks like you have moved to a newer PHP version. The OSCommerce could be either fixed or updated to the latest version. For proper suggestion I need to look at it first.
Relevant Skills and Experience
17+ experience in web programming PHP, MySQL, HTML, CSS, JavaScript and many others
11+ years experience in OSCommerce
12 years since my first project with freelancer.
Proposed Milestones
$298 USD - You don't have to release any funds until you are 100% happy from the result.
Could you send me a link to the store so I can look at it?