Arduino connectivity with infrared, Fails

I just received an Arduino card a few days ago and it's amazing. Recently I started working on the connection of infrared receivers, parallax. The sensor responds and Arduino can read it, but I get the same measurement pattern for each button. I press the remote control! I use the pulseIn command to measure 12 pulses, but I also try to measure only 8 without modification. Does anybody have an idea?