[Jon]

His logo won't actually be on your invoice. What happens, is x-cart stores all use the companyname_small.gif logo for the invoices. You shop at telafirma, and that image gets cached on your computer. When you then order on your store, the companyname_small.gif is pulled from cache so you see telafirma's logo. If you do a hard refresh on the page you should see your logo and customers to your store won't be seeing his logo (unless of course they have a similar cache problem which is not likely).