Need help with oscommerce error and contribution

i need someone to fix this Fatal error: Cannot redeclare tep_db_connect() (previously declared in /home/adults/public_html/admin/includes/functions/[login to view URL]) in /home/adults/public_html/admin/includes/functions/[login to view URL] on line 13 and i need this installed [login to view URL],2082/category,all/search,referral ONLY PHP or oscommerce experts as i need this done ASAP please