Can I upgrade to Guild Wars: Eye of the North?

I currently have Guild Wars Game of the Year Edition and I want to start playing Guild Wars: Eye of the North. According to the site it says



This item requires you have an account with at least one of the full campaigns on it.



If I buy Eye of the North can I play it or do I need to buy another version first?Can I upgrade to Guild Wars: Eye of the North?
If you have ANY other Guild Wars game, you can play Eye of the North. Eye of the North is an expansion for Guild Wars (the original), Factions, and Nightfall. So yes you can play and you don't have to buy another version.

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