print out of text message history!

Hey guys,

Does anyone know how i can get a print out of my entire text message history for one conversation on my iphone 4. I know it is in the phone because i can view it bit by bit if i continue to scroll and hit "view previous messages" but i am in the middle of a legal thing and i desperately need a print out of the history of this one conversation. There has to be a computer genius out there than can help me. There must be a way to export it to my macbook or my email or something. Please if you know anything i would be so grateful. Thank you!