Help make this work in as 3.0

Question

why am i getting this error? how do i fix it? im following a flash 8 tutorial and im using cs3 this is the only main problem I have come across so far please help me convert this so it works in as 3.0
Warning: 1090: Migration issue: The onRollOver event handler is not triggered automatically by Flash Player at run time in ActionScript 3.0.  You must first register this handler for the event using addEventListener ( 'mouseOver', callback_handler).
b1.link_mc.myText_txt.text = "Home";
b2.link_mc.myText_txt.text = "About";
b3.link_mc.myText_txt.text = "Service";
b4.link_mc.myText_txt.text = "Portfolio";
b5.link_mc.myText_txt.text = "Contact";
import flash.events.MouseEvent;
b1.onRollOver=function()
    gotoAndPlay(2);
b1.onRollOut=function()
    gotoAndPlay(14);
b2.onRollOver=function()
    gotoAndPlay(2);
b2.onRollOut=function()
    gotoAndPlay(14);
b3.onRollOver=function()
    gotoAndPlay(2);
b3.onRollOut=function()
    gotoAndPlay(14);
b4.onRollOver=function()
    gotoAndPlay(2);
b4.onRollOut=function()
    gotoAndPlay(14);
b5.onRollOver=function()
    gotoAndPlay(2);
b5.onRollOut=function()
    gotoAndPlay(14);

Answer 1

Events work a bit differently in AS3 than in AS2.  Essentially, you register an event listener with each object, and then have a function that the listener fires.
So, to revise your code:
:: CODE ::
b1.link_mc.myText_txt.text = "Home";
b2.link_mc.myText_txt.text = "About";
b3.link_mc.myText_txt.text = "Service";
b4.link_mc.myText_txt.text = "Portfolio";
b5.link_mc.myText_txt.text = "Contact";
b1.addEventListener(MouseEvent.ROLL_OVER,doOver);
b2.addEventListener(MouseEvent.ROLL_OVER,doOver);
b3.addEventListener(MouseEvent.ROLL_OVER,doOver);
b4.addEventListener(MouseEvent.ROLL_OVER,doOver);
b5.addEventListener(MouseEvent.ROLL_OVER,doOver);
b1.addEventListener(MouseEvent.ROLL_OUT,doOut);
b2.addEventListener(MouseEvent.ROLL_OUT,doOut);
b3.addEventListener(MouseEvent.ROLL_OUT,doOut);
b4.addEventListener(MouseEvent.ROLL_OUT,doOut);
b5.addEventListener(MouseEvent.ROLL_OUT,doOut);
function doOver(evt:MouseEvent):void {
     evt.currentTarget.gotoAndPlay(2);   
function doOut(evt:MouseEvent):void {
     evt.currentTarget.gotoAndPlay(14);
:: END CODE ::
So, to recap.
First you register an event listener for the ROLL_OVER and ROLL_OUT events.  I set them all to go to one function for each type, since I noted that all of the codes were doing the same thing.
Then, the two functions.  An event listener passes an event object into the function, thus the (evt:MouseEvent)
Then, I use the event object to find out which object triggered the event (evt.currentTarget) and I tell it to do the gotoAndPlay action related to the event.