Flash Slideshow Problem

I've been attempting to create a slideshow using Flash CS5.5, however I can't seem to affect the speed of the images. My code is as follows:

import flash.utils.Timer;

import flash.events.TimerEvent;

import fl.transitions.Tween;

import fl.transitions.easing.Strong;

mc1.alpha=0;

stop();

var mytimer:Timer = new Timer(1000,6);

mytimer.start();

mytimer.addEventListener(TimerEvent.TIMER,mc1handler)

function mc1handler(event:TimerEvent:void{

          if(mytimer.currentCount==1){var mytween_fadein:Tween= new Tween(mc1,"alpha",Strong.easeOut,0,1,3,true)}

}

          if(mytimer.currentCount==5){var mytween_fadeout:Tween= new Tween(mc1,"alpha",Strong.easeOut,1,0,1,true)}

          if(mytimer.currentCount==6){mytimer.stop();nextFrame();}

I thought that stop(); would solve the problem, but i've had no luck there. Any help is much appreciated,

Thanks,