The Flash Connection Make mine Actionscript 3.0!

In need of help!! I have been all over the net doing tutorials and trying different codes, but nothing has help. I have a page (web) that has 5 buttons to open and close external swf files.

I would like it if anyone could tell me what I'm dong wrong (I changed things so may times it really doesn't resemble what I started with). Im get frustrated...Can anyone help ? this is suppose to b AS3

<?xml:namespace prefix = o /> 

********************

/*Button function, with a page removal/* 

function onClick_b(mich_btn:MouseEvent):void {

}

mich_btn.addEventListener(MouseEvent.CLICK, onClick_b);

gotoAndStop(21);

function clickHandler_b(event:MouseEvent):void {

      var uil:UILoader = event.currentTarget as UILoader;

      uil.unload();

      removeChild(mLoader_b);

}

********************

*/Action frame on button select/*

import flash.display.DisplayObject;

import flash.display.Sprite;

import flash.events.MouseEvent;

var mLoader:Loader = new mLoader();

var mLoader:URLRequest = new URLRequest(tribute.swf);

mLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteHandler);

mLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgressHandler);

mLoader.load(mLoader);

function onCompleteHandler(loadEvent_m:Event) {

      addChild(loadEvent_m.currentTarget.content);

}

function onProgressHandler(mProgress:ProgressEvent) {

      var percent:Number = mProgress.bytesLoaded/mProgress.bytesTotal;

      trace(percent);

}

startLoad();

_btn.mouseEnabled = false;