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

hi, need stop cursor moving on points on stage. i'm using magnifying glass effect in browser show glass stage need stop moving past points. can see mean if move magnify glass left or right here:

 

www.zoeglazebrook.co.uk

 

this code have 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;
}

 

var moveglass:number;

 

magnifyingglass.onpress = function() {
    moveglass = setinterval(startglass,1);
};
function startglass() {

if(_root._xmouse>magnifyingglass._width/2 &&_root._ymouse>magnifyingglass._height/2&&_root.magnifyingglass._xmouse<stage.width-magn ifyingglass._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;
}

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