Convert E-commerce products into OSCommerce products

I have a custom e-commerce built in ASP 3. The website is in portuguese and you can see the database attached to this request. I have a OSCommerce website and I need the categories/products details transfered to it. The product data are in Access 2003 database. I need a script to automatically convert and fill the OSCommerce database. You can use PHP, C#, VB.NET or Java to do this task. If you know the OSCommerce products database structure, it will be a very straightforward and simple task.