Custom mouse button reliability

Question

Hi everyone, I'm having two problems with my custom cursor, which basically works. The script below is on the first frame, which is a preloader frame The first problem is that after I click on two of the buttons leading from the home frame to other frames, a few of the other buttons will disappear upon returning to the home frame, which doesn't happen otherwise, and doesn't happen for the many other functioning buttons that are set to work in the same way. When I don't use a custom cursor, all of the buttons work. My second problem is that I'd like the cursor outline to change color on rollover for all buttons without having to specify which ones, and so I tried using SimpleButton.prototype, but I obviously made a mistake, because it doesn't work. Based on trial and error, I marked in bold the lines that seem to be causing issues. Do you see the errors?
Thanks,
Jonathan
Mouse.hide();
var cursor:Sprite = new Sprite();
cursor.graphics.lineStyle(.25, 0x000000);
cursor.graphics.beginFill(0xFFFFFF, .5);
cursor.graphics.drawRect(0,0,15,15);
cursor.graphics.endFill();
cursor.visible = false;
import flash.events.Event;
import flash.events.MouseEvent;
function mouseMove(e:MouseEvent):void
if (!cursor.visible) cursor.visible = true;
cursor.x = e.stageX;
cursor.y = e.stageY;
function cursorframe(event:Event):void
    addChild(cursor);
stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
cursor.mouseEnabled = false;
cursor.mouseChildren = false;
setChildIndex(cursor, (numChildren - 1));
addEventListener(Event.ENTER_FRAME, cursorframe);
function mouseOff(evt: Event){
    cursor.visible = false;
this.stage.addEventListener(Event.MOUSE_LEAVE, mouseOff);
SimpleButton.prototype.addEventListener( MouseEvent.MOUSE_OVER, onMouseOver);
SimpleButton.prototype.addEventListener( MouseEvent.MOUSE_OUT, onMouseOut);
function onMouseOver(theEvent:MouseEvent):void
cursor.graphics.lineStyle(.25, 0xFF00FF);
function onMouseOut(theEvent:MouseEvent ):void
cursor.graphics.lineStyle(.25, 0x000000);

Answer 1

fix one problem at a time.  see if the following stops your problem with disappearing buttons:
Mouse.hide();
var cursor:Sprite = new Sprite();
cursor.graphics.lineStyle(.25, 0x000000);
cursor.graphics.beginFill(0xFFFFFF, .5);
cursor.graphics.drawRect(0,0,15,15);
cursor.graphics.endFill();
cursor.visible = false;
cursor.mouseEnabled = false;
cursor.mouseChildren = false;
import flash.events.Event;
import flash.events.MouseEvent;
function mouseMove(e:MouseEvent):void
if (!cursor.visible) cursor.visible = true;
addChild(cursor);
cursor.x = e.stageX;
cursor.y = e.stageY;
function mouseOff(evt: Event){
    cursor.visible = false;
this.stage.addEventListener(Event.MOUSE_LEAVE, mouseOff);