change the background of first 14 seconds of my video

Hello there, I am looking for someone to change the background of the first 14 seconds of a movie It is a pretty easy scene. There is only a earth spinning on galaxy image. The camera zooms in the earth and "enters" the planet. I just need you to change the background on the first 14 seconds since the rest of the scene is inside of the planet. The movie is in AVI and I don't have the source files (just the exported avi movie) The new background will be a solid black color. You can see the movie here: [login to view URL] Let me know how much and how long are you going to take to finish this. I hate spam as much as you do, so I will only respond to those that include pricing and a timeline for this project Cheers, Alex