Zoom in Zoom Out Limit AS2

you should not apply code to objects.  assign each an instance name (in the properties) and use that name in your code.

eg, if the zoom buttons/mcs have instance names zoomUp_mc, and zoomDown_mc:

var maxZoom:Number=400;

var minZoom:Number = 10;

zoomUp_mc.onPress=function(){

    _root.diesel.engine2._xscale = _root.diesel.engine2._xscale + 5;

    _root.diesel.engine2._yscale = _root.diesel.engine2._yscale + 5;

if(_root.diesel.engine2._xscale>maxZoom){

  _root.diesel.engine2._xscale = _root.diesel.engine2._yscale = maxZoom;  

}

}

zoomDown_mc.onPress=function(){

    _root.diesel.engine2._xscale = _root.diesel.engine2._xscale - 5;

    _root.diesel.engine2._yscale = _root.diesel.engine2._yscale - 5;

if(_root.diesel.engine2._xscale<minZoom){

  _root.diesel.engine2._xscale = _root.diesel.engine2._yscale = minZoom;  

}

}

on (press)

{

    _root.diesel.engine2._xscale = _root.diesel.engine2._xscale - 5;

    _root.diesel.engine2._yscale = _root.diesel.engine2._yscale - 5;

if (_root.diesel.engine2._xscale < 100)

{

_root.diesel.engine2._xscale = 100

_root.diesel.engine2._yscale = 100

}

}