script.aculo.us---Effect.Move

This effect moves an element. Effect.MoveBy is older name.

This will move object to corner of the window (x=0; y=0):

new Effect.Move (obj,{ x: 0, y: 0, mode: 'absolute'});

This will move object 30px up and 20px to the right (the default mode is ‘relative’):

new Effect.Move (obj,{ x: 20, y: -30, mode: 'relative'});

http://wiki.script.aculo.us/scriptaculous/show/Effect.Move