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Thank you Felix, I solved my problem simply using the the following command:

frame = img_bridge_.imgMsgToCv(img, "bgr8");

and now it works properly. :D

Hoping don't boring you, I have another question for you or everybody could help me: I installed ROS and openni_kinect on another computer exactly how I made previously on mine, but when I try to used the IR camera with command:

rosrun image_view image_view image:/camera/ir/image_raw

It returns me the following error:

Illegal Instruction

I've looked for a solution on the web, but I haven't found it. Could someone help me ??

Thanks in advance