Old testament verse refers to pre-trib rapture

Old testament verse refers to pre-trib rapture. From my readings I believe that Jesus will take christians from the earth just before the 7 year tribulation period. This was a verse that was mentioned on a recent bible program from Perry Stone, the episode was called Rosh Hashanah - The Day of Concealment. You can view the episode over the web if you would like.

Isaiah 26:
16 LORD , they came to you in their distress;
when you disciplined them,
they could barely whisper a prayer. [b]
17 As a woman with child and about to give birth
writhes and cries out in her pain,
so were we in your presence, O LORD .
18 We were with child, we writhed in pain,
but we gave birth to wind.
We have not brought salvation to the earth;
we have not given birth to people of the world.
(I think this describes the failure of the church and the Jews
to bring Gods word to the world)

19 But your dead will live;
their bodies will rise.
You who dwell in the dust,
wake up and shout for joy.
Your dew is like the dew of the morning;
the earth will give birth to her dead.
(I believe this refers to the rapture of the church)

20 Go, my people, enter your rooms
and shut the doors behind you;
hide yourselves for a little while
until his wrath has passed by. (I believe christians will be with God during the rapture)
21 See, the LORD is coming out of his dwelling
to punish the people of the earth for their sins.
The earth will disclose the blood shed upon her;
she will conceal her slain no longer. "

On a side note, I once asked Zola Levitt if he had to give only one reason why he believed in pre-trib what would it be.

He said the one reason was that it had to be a "surprise". If it happened mid or post trib you could figure out to the day when it would occur based on prophecy.

Also Hal Lindsey made the point that people would be oblivious that anything was occurring just as they were before the flood came. Business as usual. Well during the tribulation 1/4 of the worlds population will die, then after that 1/3 of what's left will die. Most of the worlds water will be un drinkable. Business as usual wont be going on. No one will be oblivious. If the rapture happened before the tribulation the description "business as usual" will be correct.