AS3 to AS2

Hello,

I'm not so good at ActionScript. Yet I have this AS3 snippet of code that I need to turn into AS2. Can anyone help?

Actionscript Code:

import flash.external.ExternalInterface;

//Adds the CLICK eventlistener to the button btn1
btn1.addEventListener(MouseEvent.CLICK,openColorBox)

//Launches the JS function that we created earlier.
function openColorBox(e:MouseEvent){
ExternalInterface.call("launchColorBox","http://www.designfission.com/");
}

Thanks!

maybe this:

actionscript Code:

import flash.external.ExternalInterface;

//Adds the CLICK eventlistener to the button btn1
btn1.onPress = function(){
    openColorBox();
}

//Launches the JS function that we created earlier.
function openColorBox(){
ExternalInterface.call("launchColorBox","http://www.designfission.com/");
}