Simple Camera Movement tutorial

Hi, I have finished the Simple Camera Movement ( animation) but when I press the ANIM button then play, it a animation I done a couple of weeks ago comes up at the end of it.
I have done three different ones but the thing keeps coming at the end of the animation.
I seet the end for 50 & the anim stops at 50, but when I playback it goes right through until 250 frames with the old one still there.
Can anyone please point out what I am doing wrong.
Thanks Mac

http://blenderartists.org/forum/showthread.php?t=87515

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Thanks very much.
Mac