Dear Fellow Grid Inhabitants,
Please understand that making your avatar completely invisible is in dubious taste. There also is no known way to consistently hide your name tag from another's view.
If you're doing it so that special someone doesn't know you're there, it is called stalking. Stalking is considered a form of griefing and is forbidden by the ToS.
Yes, I host a page about invisiprims. Yes, I offer some for free. Yes, I sell the Invisible Man Avatar - notice that he's outlined. No, I'm not going to make you entirely invisible.