Getting buttons to work

Question

I'm trying to create an informative flash program on Mt. St. Helens about the dust cloud it created when it errupted.  I have everything ready to go including the buttons and the pages the screen or next image it should take you to.  I'm just stuck on how I get the buttons to actually take you to the next frame.

Answer 1

Alright I figured some stuff out on myself here but i'm still stuck...I changed my coding to this:
stop()
previousbutton.addEventListener(MouseEvent.CLICK,backward);
nextbutton.addEventListener(MouseEvent.CLICK,forward);
function forward(event:MouseEvent){
if(this.currentFrame == this.totalFrames){
  gotoAndStop(1);
else{
  nextFrame();
function backword(event:MouseEvent){
if(this.currentFrame == 1){
  gotoAndStop(this.totalFrames);
else{
  prevFrame();
Yet i'm still getting these errors:
Scene 1, Layer 'actions', Frame 1, Line 9    1084: Syntax error: expecting identifier before rightparen.  }
Scene 1, Layer 'actions', Frame 1, Line 10  1084: Syntax error: expecting rightbrace before leftbrace.  else{
Scene 1, Layer 'actions', Frame 1, Line 18  1084: Syntax error: expecting identifier before rightparen.  )
Scene 1, Layer 'actions', Frame 1, Line 19  1084: Syntax error: expecting rightbrace before leftbrace.  else{