ActionScript 3.0 :: Creating Slideshow That Automatically Changes Frame After Certain Time

This is my first flash project and I am attempting to create a slide show that automatically changes frame after a certain time, but also have buttons for each frame. [URL] is the page where i have the flash slideshow on. I used a tutorial to make the nav bar, and used what I learned there, as well as some googling to attempt the slideshow. So far I think its turned out pretty good, but I have a problem. THe buttons work fine, but the auto change gets stuck on the second slide, even if I click to a differnet button to goes back to frame 2. Which makes me think that the function doesn't even go past the if(frame==1). here is the code

Code:
import fl.transitions.Tween;
import fl.transitions.easing.*;
import flash.events.MouseEvent;
var img1FadeIn:Tween = new Tween(img1, "alpha", Strong.easeOut, 0, 1, 5, true);
stop();
var slideTimer = setInterval(nextslide, 8000);
[Code] .....