Watermark cover-up for 10 short video clips

I have ten video files that I have already edited down to the length I deisre them to be. There is an old url that runs along the bottom of each for the entire length. I need this edited out. My regular video guy is unavailable but he usally uses Final Cut Pro to place a box over this old url watermark and then places the new url over the box (with a little fade-in and fade-out so that it looks reasonably preofessional) so that my new url is the one watermarked along the length of the clip. Each clip is between 1 and 5 minutes in length and the watermark is in the same exact place for all 10 so you can pretty much set the cover up block timeline and the new url timeline on a saved setting. I will ftp the videos for you to download and when you are done you can re-ftp them. I am looking for someone that can do this in 1 day.