Resetting scale device on stage

1

Please view
http://www.sergemedia.net/ds2/map/lissarazoomfix.html
Click on lot 41. It zooms to 200%. That works. then Manually move slider to 100%. It zooms out. Click on another lot. It snaps back to 200%. That works. Now go back to lot 41. The zoom slider is still positioned where you moved it to. The map is still at 200%, but slider is not located at 200%. I need it to reset to 200%, every time a lot is clicked it needs to go back to 200%, even if its been manually moved to a lower percentage.
This is the code for the scaling device. I think I am looking for a line of code that will force the zoom handle to go to 200% when lot is clicked. It does work initially, its just when the slider is moved, it does not reset to 200%.


onClipEvent(load){

	scrollMin = _root.range._x+_root.range._width // minimum _x value possiible for scrollbar
	scrollMax = _root.range._x // maximum _x value possiible for scrollbar

	lowestScale = 50 // lowest desired scale of map in %
	highestScale = 100 // highest desired scale of map in %

	_x = scrollMin + (scrollMax - scrollMin)/25     //puts handle at 200%

	scaleFactor = Math.pow(highestScale/lowestScale,1/(scrollMax-scrollMin)) // variable for SetScale
	function SetScale(){
		// calculates scale and sets it
		_root.scale = _root.map_mc._xscale = _root.map_mc._yscale = lowestScale * Math.pow(scaleFactor,(scrollMax-_x))
	}
	SetScale()
}
onClipEvent(mouseMove){
	if (dragging){
		_x = Math.min(Math.max(_parent._xmouse,scrollMax),scrollMin)
		SetScale()
		updateAfterEvent();
	}
}