Pong game - move slider

Hi

I’m adapting a pong flash game.

I’m having trouble moving a slider that controls the speed that the ball travels at - as soon as I move the slider (to the bottom
of the game rather than the current right hand position) - and update the startDrag coordinates - the computer’s pong racket movement
becomes erratic.

You can see the demo game here: http://www.dirksmith.com/pong/pongTest.html

Grateful for any help.

.fla attached

Dirk

The scripts are:

slider actionscript on main timeline

onClipEvent (enterFrame) {
/:drag = Math.round(_root.diff._y - this._y)/ -10 ;

slider mc actionscript:

on (press) {
startDrag(_root.setter, false, 26, 65, 26, 140);
}
on (release) {
stopDrag();