How to make a line follow a motion path

alright, i'm gonna try and explain this as best as possible. i want to do something like what apple did for the motion video, where lines follow a motion path. but my problem is that when the line hits a keyframe, the line stays straight and turns its axis (looking ********), unlike apple's vid where the line itself turns and curves around each keyframe.....alright does that make any sense? look at the picture below, see how the lines are curved to follow a path....my lines stay straight and look like the second pic.
http://img279.imageshack.us/img279/1269/picture59rh.png RIGHT WAY
[img=http://img279.imageshack.us/img279/1387/picture68sb.th.png] WRONG WAY
iMac G5 Mac OS X (10.4.5)

Don't do it like that. Create a curved line and use a replicator on it...
Patrick

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How to make a line follow a motion path

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