Keeping an object level to the floor at the end of a chain

I have a chain of two lines. One rotates from a fixed point
on the floor, the second rotates from a fixed point and the end of
the first. At the end of the second line I have an object I'd like
to swing freely. I'd always like it to stay 'level' to the floor,
regardless of the position of the two lines. So, sort of link
robotic arm dangling something.
Is there a way to 'get' the angle of an object?
Thank you....

Alrighty: I'm simulating the motion of an excavator. During
it's motion, it has 3 primary components. The 'boom', the 'stick'
and the 'bucket' I'm going to be as detailed as possible about my
build.
Visit:
http://net.shoring.com/movax_test.html
It'll ask for a u/n and p/w. Use 'guest' for both fields.
The movement is simply done by using the arrow keys to
control the playhead inside the yellow and black line. I used a
motion tween to restrict the range of movement.
The blue box, is what I'd like to keep 'level' in
relationship to the thick black line.
Hope that helps...sometimes a visual reference makes all the
difference.
Thanks for the attention....

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