lookups in other worksheets....

I have two worksheets. One with textures and one with models.
I want to know how many models a texture is used in.

So I have libraryfile, texturefile in the TEXTURES worksheet and
texture, modelfile in the MODELS worksheet.

I've been toying with find.row, but to see if it is really there. If
it's not, I'll get N/A..