I'm a complete newbie trying to build a simple website using Flash CS3 and Actionscript 3.0.

I have a text box and have created up and down buttons for scrolling.

I am using this action to make the buttons work:

Actionscript Code:
up_btn.addEventListener(MouseEvent.MOUSE_OVER, scrollUp);  
down_btn.addEventListener(MouseEvent.MOUSE_OVER, scrollDown);  
function scrollUp(Event:MouseEvent):void {  
    bio_text.scrollV --;  
function scrollDown(Event:MouseEvent):void {  
    bio_text.scrollV ++;  

So right now the text is only scrolling one line at at time when the mouse is over the button. How do I get it to scroll continuously as long as the mouse is over the button?

Thank you for your help!