'plz' is not an English word.
Every graphics card has their texture size limits. For older graphics card this can be quite a limit.
The only thing you can do is split the texture into multiple parts and not a contiguous one.
I strongly advise you to not use SFML 1.6 anymore, because it's around 2.5 years old, has a few nasty bugs (i.e. ATI bug) and lacks a lot of nice features (better graphics API, sf::VertexArray, sf::RenderTexture, ...).
If you decide to update (which you should!), then you also get the possibility of using Thor's
sf::BigTexture and
sf::BitSprite.