Install OScommerce

http://www.siteground.com/tutorials/oscommerce/oscommerce_manual_installation.htm

forum
http://www.oscommerce.info/

To upload your pages directly from the cPanel, please login to your account and select the File Manager icon from the cPanel's main page. A new window will open, listing files and directories, found on your web space. Please click on the folder image in front of the www directory.

The www directory is the one where you site needs to reside in order to be viewable. At the top of the list you will see an arrow image – please select that to be prompted to select 12 files from your local computer to be uploaded. After the files are chosen, you need to click the Upload button.

Please note that depending on file size and Internet connection, the upload may take some time to complete. After the transfer is over, a confirmation message will appear, and you will be able to see the new files in the list.