var total:Number=0;
var xpos:Number=0;
var ypos:Number=0;
btn.onPress=function()
{
    total = total + 1;
    xpos = xpos + 100;
    ypos = ypos + 100;

    var p:MovieClip = _root.attachMovie("phist", "phist"+total, _root.getNextHighestDepth());
    p._x = xpos;
    p._y = ypos;
}