Basic toy ski lift.

[garygav]

Hi I have basically no knowledge of electronic circuitry so I am looking for some advice on the most simple way of constructing a motorised ski lift as a moving christmas decoration.

I basically want it so that a motorised pulley will pull little cardboard ski lifts up and down in opposite directions. I want them to travel one way for a certain number of seconds and then reverse direction.

I would appreciate if someone could point me towards something I could put into a simple battery pack and maybe two of these motors,http://www.jaycar.co.uk/productView.asp?ID=YG2741&form=CAT2&SUBCATID=983#1 , circuit that would auto reverse the motor direction every few seconds.

Apologies for the terrible sketch attached i'm just in a rush at the moment.