linker question

I am getting the follwing linker error.
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dx9game.obj : error LNK2019: unresolved external symbol _D3DXCreateSprite@8 referenced in function _WinMain@16

1>C:\Users\phil\documents\visual studio 2010\Projects\dx9game\Debug\dx9game.exe : fatal error LNK1120: 1 unresolved externals

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped =========
I am probably missing a library but dont know which one.

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