HELP ME FOR THIS

1>------ Build started: Project: ELExTrO D3D, Configuration: Release Win32 ------
1>Compiling...
1>d3dmenu.cpp
1>c:\documents and settings\userxp\my documents\downloads\elextro d3d\elextro d3d\d3dmenu.h(5) : fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1>Quelle.cpp
1>.\Quelle.cpp(15) : fatal error C1083: Cannot open include file: 'D3DX9.h': No such file or directory
1>Base.cpp
1>.\Base.cpp(2) : fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1>Build log was saved at "file://c:\Documents and Settings\UserXp\My Documents\Downloads\ELExTrO D3D\ELExTrO D3D\Release\BuildLog.htm"
1>ELExTrO D3D - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========