need converting of some simple as2 to as3

[createns]

hi,

im extremely new to flash

however photoshop, illustrator and 3dstudio max are my backgrounds
so i'm not a complete noob

anyways, i've been using the craig campbell tutorial for making a webpage in flash and after creating a movieclip for an animated button ive discovered that the tutorial being for flash 8 uses as2, whereas i'm using flash cs3... obviously using as3

can anyone help convert my script so that it will work?

here's the script:

btn_design_mc.onRollOver = function (){
    btn_design_mc.gotoAndPlay("_over");
}

btn_design_mc.onRollOut = function (){
    btn_design_mc.gotoAndPlay("_out");
}

anyhelp would be great
thanks

[Slowburn]

import flash.display.MovieClip;
import flash.events.MouseEvent;

btn_design_mc.addEventListener( MouseEvent.MOUSE_OVER, onRollOver );
btn_design_mc.addEventListener( MouseEvent.MOUSE_OUT, onRollOut );
btn_design_mc.addEventListener( MouseEvent.CLICK, onClick );

function onRollOver( event:MouseEvent ):void
{
     var btn:MovieClip = event.target as MovieClip;
     btn.gotoAndPlay( "_over" );
}
function onRollOut( event:MouseEvent ):void
{
     var btn:MovieClip = event.target as MovieClip;
     btn.gotoAndPlay( "_out" );
}

function onClick( event:MouseEvent ):void
{
     trace( "You clicked: " + event.target );
}

[panel]

BTW
is you are using Flash CS3 you don't have to use as3. You can still create as2 project.