ActionScript 3.0 :: Error 1120 When Creating Buttons From Images?

I have 3 images that are displayed sequentially. Image 1: layer 1 (frame 1 to frame 24), Image 2: layer 2 (frame 25 to 49), Image 3: layer 3 (frame 50 to 74).  The opacity of each image changes in its frames and and each image has a classic tween associated with it.  Pretty basic stuff.
 
On frame 1 of the first image I created a symbol that is a button, lets call it image1_btn.  On frame 50 of the third image I created a second button, lets call it image3_btn.I created an Actions layer as the first layer and wrote the following code:
  
image1_btn.addEventListener(MouseEvent.CLICK,onimage1Click);var image1link:URLRequest = new URLRequest("http://purplerosehome.com/shopping/spartina_449/page_1.aspx")function onimage1Click(event:MouseEvent):void{    navigateToURL(image1link);}  
image2_btn.addEventListener(MouseEvent.CLICK,onimage2Click);var image2link:URLRequest = new URLRequest("http://purplerosehome.com/shopping/le_cadeaux/page_1.aspx")function onimage2Click(event:MouseEvent):void{    navigateToURL(image2link);}  

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