Is the Rapture Pre Tribulation or Post Tribulation.

I'm not sure what the majority view is but I think it is Pre-tribulation.  That was the story line in the Left Behind series of books. 

But is that what Scripture says?  I haven't studied the question extensively but here is some Scripture I found today in Revelation.
 

I think this passage gives us a clue.  Let me set the stage.  This passage appears 3 1/2 years into the Tribulation.  The two witnesses have been killed, resurrected, and ascended into Heaven.  Then the 24 Elders in Heaven start singing this song.
 

Revelation 11:17-18(NKJV)

saying:      “We give You thanks, O Lord God Almighty,     The One who is and who was and who is to come,     Because You have taken Your great power and reigned.

    The nations were angry, and Your wrath has come,     And the time of the dead, that they should be judged,     And that You should reward Your servants the prophets and the saints,     And those who fear Your name, small and great,      And should destroy those who destroy the earth.”

That indicates to me that the Rapture is yet to come.  We are told that Jesus will return descending from Heaven.  At that time the dead in Christ will rise to meet Him.  After that then those who are alive in Christ will ascend to meet Him.
 

With the reference to "the time of the dead, that they may be judged" gives us the clue that we need to see that the Rapture is yet to come.