Scrolling content from a different frame

programming flash
1

Hello people!
I really need your help!

The scenario is:
An HTML frameset with 2 frames. I need to create a button in Actionscript 3 (and put it in the top frame) in order to scroll down the content of the main frame. I thought of Javascript. I end up writing a script that works but when I call the Javascript function in Actionscript nothing happens. Maybe a silly mistake maybe not…

If you want to test it, download my files: http://www.mediafire.com/file/hokzzzwy1rt/scrolltest.rar

My source code is:

The Javascript in the html of the top frame:

<SCRIPT LANGUAGE="JAVASCRIPT" TYPE="TEXT/JAVASCRIPT">
  <!--
   
  function pageScrollDn() 
  { 
     top.mainFrame.scrollBy(0,15);  
     timeID = setTimeout('pageScrollDn()',100);  
  } 
  function stopScroll()  
  { 
     clearTimeout(timeID); 
  }  
   
  //-->
  </SCRIPT>

The actionscript for the button:

button.addEventListener(MouseEvent.MOUSE_OVER, pageScrollDn);
  button.addEventListener(MouseEvent.MOUSE_OUT, stopScroll);
   
  function pageScrollDn(e:MouseEvent):void{
  ExternalInterface.call("pageScrollDn");
  }
   
  function stopScroll(e:MouseEvent):void{
  ExternalInterface.call("stopScroll");
  }

I would really appreciate any ideas…