Need to stop my cursor leaving the flash stage area in browser?

Question

Hi, I need to stop my cursor from moving on certain points on the stage. I'm using a magnifying glass effect but in the browser this only show the glass up to the stage so I need to stop it moving past those points. You can see what I mean if you move the magnify glass to the very left or right here:
www.zoeglazebrook.co.uk
this is the code I have for the magnify glass:
var moveGlass:Number;
magnifyingGlass.onPress = function() {
    moveGlass = setInterval(startGlass,1);
function startGlass() {
    magnifyingGlass._x = _root._xmouse;
    magnifyingGlass._y = _root._ymouse;
magnifyingGlass.onEnterFrame = function(){
     this.largeobject._x = (this._parent.original._x-this._x)*2;
     this.largeobject._y = (this._parent.original._y-this._y)*2;

Answer 1

kglad wrote:
var moveGlass:Number;
magnifyingGlass.onPress = function() {
    moveGlass = setInterval(startGlass,1);
function startGlass() {
if(_root._xmouse>magnifyingGlass._width/2&&_root._ymouse>magnifyingGlass._height/2&&_root. _xmouse<Stage. width-magnifyingGlass._height/2){
    magnifyingGlass._x = _root._xmouse;
    magnifyingGlass._y = _root._ymouse;
magnifyingGlass.onEnterFrame = function(){
     this.largeobject._x = (this._parent.original._x-this._x)*2;
     this.largeobject._y = (this._parent.original._y-this._y)*2;