Fly_Emirates - it is a 737-400. There are two easy ways to tell the difference between the classic 737s and the NG 737s:
1) The pitot tubes are beneath the rear window of the flight deck on the classics. On the NGs, they are forward of the flight deck.
2) The engines on the classics have a cone at the back. On the NGs, this has been replaced by something that looks more like a stick.
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh