I have a CSS problem. Any web designers know how to define foreign language fonts?

My problem is that I have a page that renders fine on my Mac but when I upload it to the server the foreign characters display in the browser as [?][?][?][?][?][?][?]

P.s. I'm a whiz at English. I do copy-editing for a publisher.

I'm also an Electronics Engineer, meaning I can sometimes fix things at component level. I used to repair CB radios, for example, before they got computerised.

I have a CSS problem. Any web designers know how to define foreign language fonts?

My problem is that I have a page that renders fine on my Mac but when I upload it to the server the foreign characters display in the browser as [?][?][?][?][?][?][?]

P.s. I'm a whiz at English. I do copy-editing for a publisher.