Help! at wits end

1

The following loads from a text file and updates map tiles. My problem is remove the map tiles i have added to the container MiniMap when the level updates.
I have two buttons on the stage for next and previous levels.

Any way i remove them or tutorials i follow return strange errors or event handlers being called multiple times.

Below is my entire main fla.

If requested i can upload the entire project. its really only 6txt files and a .as file with a simple class.
[AS]
var currentLevel:int = 2;
import scripts.levels.level1;
init();
txtCurrent.text = String(currentLevel);
function init():void {//function started void reutns nothing
stage.addEventListener(MouseEvent.CLICK,StartGame);//stage
}

function StartGame(e:MouseEvent):void {
stage.removeEventListener(MouseEvent.CLICK,init);
stage.removeEventListener(MouseEvent.CLICK,StartGame);
loadMap();
}
function loadMap():void {//fucntion for loading the maps- done like this so changing maps is easy
var l1:level1 = new level1();
l1.loadStuff(currentLevel);
l1.addEventListener(Event.COMPLETE,l1COMPLETE);
btnPrev.addEventListener(MouseEvent.MOUSE_DOWN, functionPrev);
btnNext.addEventListener(MouseEvent.MOUSE_DOWN, functionNext);

function functionPrev(event:MouseEvent):void {
    if (currentLevel >1) {
        currentLevel -=1;
        newMM();
    }
    txtCurrent.text = String(currentLevel);
}
function functionNext(event:MouseEvent):void {
    if (currentLevel <6) {
        currentLevel +=1;
        newMM();
    }
    txtCurrent.text = String(currentLevel);
}

function newMM() {
    l1.loadStuff(currentLevel);//pass the next level, will cause the below function to run once.
}
function l1COMPLETE(evt:Event) { //run when the txt has finished loading
    //Container for the Tiles
    var MiniMap:MovieClip = new MovieClip();
    MiniMap.x = 1;
    MiniMap.y = 1;
    MiniMap.scaleX=.2;
    MiniMap.scaleY=.2;
    addChild(MiniMap);
    var count = 0;
    //following adds the minimap tiles acording to the txt file x and y
    for (var i = 0; i < l1.terrainArray[0]; i++) {
        for (var j = 0; j < l1.terrainArray[1]; j++) {
            var d:MovieClip = new MiniMapTile();
            d.x = d.width*j;
            d.y = d.height*i;
            d.name = "tile"+count;
            MiniMap.addChild(d);
            count++;
        }
    }//following loads the graphics of the tiles
    for (i=0; i<=l1.terrainArray[0]*l1.terrainArray[1]-1; i++) {
        var tmpMC:MovieClip = MiniMap.getChildByName("tile"+i)as MovieClip;
        tmpMC.gotoAndStop(l1.terrainArray[i+2]);
    }
}

}[/AS]