Where to find 1.2?

ive downloaded and included glext.h but i still have the glTexImage3D undeclared. Everything else is fine now. Do i need to get version 1.2? where can i find it?

look at nehe.gamedev.net for information on loading extensions, you could also do a search on this forum. This has been discussed many many times and in far greater detail than I can provide. Nehe has a great tutorial on extension loading, thats probably a good place to start.