Creating an Event Listener

I'm trying to learn how to create an event listener with ActionScript 2 in Flash CS6. I took over some Flash projects at work and know only basic code, and have nobody to help with the more complex stuff! I've looked at quite a few tutorials and forum posts but can't figure out how to use the other code I've seen in my own project. I'll try to describe as best as I can.

My main file has two movie clips called "content_mc" and "sideNav_mc" that I am loading and swapping swfs into. In the swf loaded into "content_mc" I have six buttons. When one of these buttons is clicked, it needs to load "menu.swf" into "sideNav_mc" and then gotoAndPlay the frame that correponds with the button that was clicked. So if a user clicks "button3_btn" then "menu.swf" will load and automatically start at frame 3.

Can anyone help me figure out what code to use for this, using the swf/instance names I provided above? Thanks!

Here is the best I could come up with for the code but it's not working. It does load the movieclip into sideNav_mc but it doesn't go to the frame I need to. I suspect it has to do with the target paths in the loadListener function.

var LoadListener:Object = new Object();

loadListener.onLoadComplete = function(){
_root.sideNav_mc.gotoAndPlay (3);
}

var mcLoader:MovieClipLoader = new MovieClipLoader();
mcLoader.addListener(loadListener);

button3_btn.onRelease = function(){
mcLoader.loadClip ("missionSpace/menu.swf", _root.sideNav_mc);
}

Maybe you can adapt this...

Code:

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var num = 0;
var sideNavListener:Object = new Object();
var sideNavLoader:MovieClipLoader = new MovieClipLoader();
sideNavLoader.addListener(sideNavListener);
sideNavListener.onLoadInit = goPage;

var contentListener:Object = new Object();
var contentLoader:MovieClipLoader = new MovieClipLoader();
contentLoader.addListener(contentListener);
contentListener.onLoadInit = prepBtns;
contentLoader.loadClip("btns.swf",content_mc);

function prepBtns(mc:MovieClip) {
        mc.button1_btn.onPress = loadMenu;
        mc.button2_btn.onPress = loadMenu;
        mc.button3_btn.onPress = loadMenu;
        mc.button4_btn.onPress = loadMenu;
        mc.button5_btn.onPress = loadMenu;
        mc.button6_btn.onPress = loadMenu;
}
function loadMenu() {
        num = this._name.charAt(6);
        sideNavLoader.loadClip("menu.swf",sideNav_mc);
}
function goPage(mc:MovieClip) {
        mc.gotoAndStop(num);
}

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