Does anyone know if it's possible to create movement (or any change of state) without tweening across the timeline?

This seems to be my biggest barrier to creating v. small swf sizes.

For instance, if I wanted to move a symbol across my background on a button click, say, could I script the clip to change the x and y positions over a number of frames rather than 'either/or'? At the moment, I'm having to use tweening and the timeline which is fine but I'm sure that if I could script it instead - my file sizes would be much smaller.

many thanks in advance

onedot