How to replace trackpad GLASS?

Well, I got angry and smacked my MB470LLA MacBook Pro. I know, not the smartest thing, but my trackpad glass is now broken and I want to fix it before I sell the computer. I've found lots of guides for replacing the trackpad, but I don't want/need to do that. The mouse functions perfectly - the glass is just cracked. It's mainly an aesthetic issue...one that if you're selling the computer can cost you a couple hundred bucks. Anyway, can anyone direct me on what part I need (can't find a code for just the glass) and a how-to for replacing the glass only? Model number is MB470LL/A, 2.4 GHz.