[away3d] How to increase the width and height of skybox ..?

[Arul]

Hello all,
          I want to make a simple room... User can walk through the
room.. With in the room  i place small 3ds components ... so i use
skybox... I dont know how to increase the width and height... is any
other idea to make a room...

Previously i use SegmentsExtrude ... create floor and ceil using
plane.. create other three faces using SegmentsExtrude .. But i dont
know how to walk through the room using camera...  Here i mentioned
the Listeners.. using the listeners camera walk around the component..
does not go inside.. how to do this...

thanks
arul

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CODE
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                public function initObjects():void {
                        var xPoints:Array = new Array();
                        xPoints.push(new Number3D(0, 0, 0));
                        xPoints.push(new Number3D(0, 0, wallwidth));

                        var yPoints:Array = new Array();
                        yPoints.push(new Number3D(0, 0, 0));
                        yPoints.push(new Number3D(wallwidth, 0, 0));

                        var zPoints:Array = new Array();
                        zPoints.push(new Number3D(wallwidth, 0, 0));
                        zPoints.push(new Number3D(wallwidth, 0, wallwidth));

                        scene.addChild(createSegment(xPoints));
                        scene.addChild(createSegment(yPoints));
                        scene.addChild(createSegment(zPoints));
                        scene.addChild(createFloor());
                        scene.addChild(createCeil());
                }

                public function createSegment(aPoints:Array):SegmentsExtrude {
                        //generate the wall
                        var wallThickness:Number = 20;
                        //aPoints.push(new Number3D(0, 0, 0));

                        var segment:SegmentsExtrude = new 
SegmentsExtrude(aPoints,
{coverall: false, axis: "y", offset: wallHeight, recenter: true,
closepath: false, subdivision: 10, thickness_subdivision: 1, flip:
false, thickness: wallThickness, bothsides: true, segmentsH: 24,
segmentsW: 12, material: front});
                        segment.bothsides = true;

                        return segment;
                }

                public function createFloor():Plane {
                        var plane:Plane = new Plane({width: wallwidth, height: 
wallwidth,
segmentsH: 24, segmentsW: 12, material: down});
                        plane.moveRight(wallwidth/2);
                        plane.moveForward(wallwidth/2);
                        plane.bothsides = true;
                        return plane;
                }

                public function onEnterFrame(e:Event):void {
                        if (over){
                                camera.targetpanangle = 0.3 * (stage.mouseX - 
lastMouseX) +
lastPanAngle;
                                camera.targettiltangle = 0.3 * (stage.mouseY - 
lastMouseY) +
lastTiltAngle;
                        }
                        camera.hover();
                        viewer.render();
                }

                private function onMouseOver(e:MouseEvent):void {
                        over = true;
                        lastMouseX = stage.mouseX;
                        lastMouseY = stage.mouseY;
                        lastPanAngle = camera.panangle;
                        lastTiltAngle = camera.tiltangle;
                }

                private function onMouseLeave(e:Event):void {
                        over = false;
                }

                public function createCeil():Plane {
                        var plane:Plane = new Plane({width: wallwidth, height: 
wallwidth,
segmentsH: 24, segmentsW: 12, material: up});
                        plane.moveRight(wallwidth/2);
                        plane.moveForward(wallwidth/2);
                        plane.moveUp(wallHeight);
                        plane.bothsides = true;
                        return plane;
                }