Oh, and to come back to two points that Tulac and russ mentioned...
If you could go back in time and change something, that would effect the things to come.
1) Lets say you would create a time machine today and go back in the past with it. You'd go back to let's say year 1925, find Adolf Hitler and kill him, so there'd be no Nazi movement in Germany.
Not counting the fact you'd be causing great differences in the political balance of the world (who knows what would happen between the Soviet Union and the Western world if there would be no WW2), you would also do something else.
You were born after WW2, so when the date of your birth took place (in the now changed time line) you - or the rest of the world would know nothing of Adolf Hitler, so even if you'd create the time machine again you wouldn't go back to the year 1925 to kill Hitler, so you wouldn't change the timeline and it would again return to the way it was before - where again you'd change it and so on. It would be a cycle that would loop up to the point where you went back in time and both timelines would most probably colapse at the end of it.
2) About something being constant...
Seeing how the time line did not colapse yet and we're living fairly normally inside it, there is also a possibility that you can't change nothing.
Imagine you'd go back to the WW1 and try to kill Hitler there (yeah, I guess I'm obsessed with killing a dead guy) and you'd find him on the frontline. You'd shoot, miss and kill another soldier who (if not killed) would have killed Hitler.
So if you wouldn't go back in the past Hitler would be dead. The fact he wasn't was because you tried to interfeare. By trying to change sometihng in the past you actually made things the way there were in the timeline you know, so you would breake the timeline if you wouldn't travel to the past. This would mean there is a constant and whatever you would do wouldn't effect anything, because it was suppose to happen that very same way. In that way it would be probably that you'd do more damage by not going into the past.
Can't you just tell I love such stuff. I really like "removing the dust" so to say off these different theories of mine.
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