Attachmovie replaces movieclips

1

hey, probably a really simple error, but here goes…

I am making a game, called manior impossible (a rip of mansion impossible, pretty much). In it, I need random spawning houses. So I have set up an array to keep track of where they are, and I have set out a random number to choose where it goes.

However, everytime it makes a house, it replaces the last one, and I have no idea why!

Here is the code:


//to make a house appear
function houseAppear() {
    houseInt = setInterval(house, (random(15)+15)*500);
    function house() {
        
        //whichH = random(3)+1
        whichH = 1;
        switch (whichH){
            case 1:
                houseid = random(shouse.length);
                
                if (shouse[houseid][2] == "1"){
                    trace("this spot is actually taken");
                }else{
                    trace("small at "+shouse[houseid][0]+","+shouse[houseid][1]+" of ID mc_house"+houseid);
                    shouse[houseid][2] = "1";
                    attachMovie("mc_shouse", ("mc_shouse"+houseid), (this._x + this._y*450), {_x:shouse[houseid][0], _y:shouse[houseid][1]});
                }
                    break;
            case 2:
                trace("m");
                break;
            case 3:
                trace("l");
                break;
        }
            
    }
}

as you can see, there will be 3 types of hosues, but I am just made it so that only one appears for now. I apologise for the horrible coding!

here is the fla if you need it too:
http://munkydesigns.co.uk/game.fla

cheers if anyone can shed some light on this!