MouseOver problem - Simple Gallery and Text

I'm running CS6 windows 64bit
Actionscript 3.0

I am trying to make a simple MouseOver gallery ...

I have a banner of 4 pics as buttons, when I MouseOver the pic the (appropriate) text should show, it kind of does but it jiggles and flashes on the screen.

The gallery should have 4 pics but I have removed them to reduce file size so I can upload here.

I did inc the full actionscript tho.

PHP Code:

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stop();

al_btn.addEventListener(MouseEvent.MOUSE_OVER,abuttonOver);
function abuttonOver(event:MouseEvent):void
{
    gotoAndStop(5);
}
al_btn.addEventListener(MouseEvent.MOUSE_OUT,abuttonOut);
function abuttonOut(event:MouseEvent):void
{
    gotoAndStop(1);
}
    
    
    dik_btn.addEventListener(MouseEvent.MOUSE_OVER,bbuttonOver);
function bbuttonOver(event:MouseEvent):void
{
    gotoAndStop(10);
}
dik_btn.addEventListener(MouseEvent.MOUSE_OUT,bbuttonOut);
function bbuttonOut(event:MouseEvent):void
{
    gotoAndStop(1);
}
    
    lab_btn.addEventListener(MouseEvent.MOUSE_OVER,cbuttonOver);
function cbuttonOver(event:MouseEvent):void
{
    gotoAndStop(15);
}
lab_btn.addEventListener(MouseEvent.MOUSE_OUT,cbuttonOut);
function cbuttonOut(event:MouseEvent):void
{
    gotoAndStop(1);
}
    
    mal_btn.addEventListener(MouseEvent.MOUSE_OVER,dbuttonOver);
function dbuttonOver(event:MouseEvent):void
{
    gotoAndStop(20);
}
mal_btn.addEventListener(MouseEvent.MOUSE_OUT,dbuttonOut);
function dbuttonOut(event:MouseEvent):void
{
    gotoAndStop(1);
    } 


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