Image overlapped with Kinect [closed]

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Hi, I'm new in ROS and this is my first question, so I don't know if I'm going to ask a silly question. I've looked a lot of tutorials and other asked questions and thanks to that I've solved a lot of my doubts, but I'm still having problems.

My purpose: obtain a point cloud from a Kinect mounted in a robot. So far, I have mounted the camera based on the one of the PR2. Using rosbag, I've recorded the data from the rgb and the depth topics. Then, using rxbag, I can visualize perfectly the rgb's images, but when I try to do the same with the depth, I got an overlapped and displaced image. I don't know how to explain it better. Here you have what I get: http://desmond.imageshack.us/Himg337/scaled.php?server=337&filename=pr2depth.jpg&res=landing

And here's what I get with the rgb's topic: http://desmond.imageshack.us/Himg406/scaled.php?server=406&filename=pr2rgb.jpg&res=landing

I don't know if I'm doing something wrong or if whats I see is correct.

I'm using Fuerte in Ubuntu 12.04

Can anyone help? Thanks in advance!