Please Help with understanding parameters being passed in a function

programming flash
1

how is it that the parameters being passed in the loaderListener.onLoadProgress function a reference of the mc doing the events? i’m having a hard time understanding this. :-/


var mcl:MovieClipLoader = new MovieClipLoader();

somBtn.onRelease = function() {
    mcl.loadClip("some.swf",someMc);
};

var loaderListener:Object = new Object();

loaderListener.onLoadProgress = function(target:MovieClip, bytesLoaded:Number, bytesTotal:Number) {
    txtLoaded.text = String(Math.floor(bytesLoaded/bytesTotal*100))+"% loaded";
    mcProgress._xscale = bytesLoaded/bytesTotal*100;

mcl.addListener(loaderListener);
};

please can someone explain this to me in layman terms would very much be appreciated.

thank you