actionscript 3.0 to 2.0 conversion

Below is my action scripting for 3.0.  However, I need this converted to 2.0 in order to use it with Adobe Captivate.  The book I have only shows me how to do the script in 3.0.  So I'm not sure how to change it to 2.0.  Can anyone help?

function scrollUp(event:MouseEvent):void
{
content_txt.scrollV -= 2;
}

function scrollDown(event:MouseEvent):void
{
content_txt.scrollV += 2;
}

up_btn.addEventListener(MouseEvent.CLICK, scrollUp);
down_btn.addEventListener(MouseEvent.CLICK, scrollDown);