Fragment Bumpmap Shader Doesn't Work

There is some cool code on this page to render bumpmaps using CG code, except... it doesn't render anything when i add a bumpmap. [http://en.wikibooks.org/wiki/Cg_Programming/Unity/Lighting_of_Bumpy_Surfaces][1] [1]: http://en.wikibooks.org/wiki/Cg_Programming/Unity/Lighting_of_Bumpy_Surfaces