var my_array:Array = new Array();
for(var i:Number=0;i<100;i++){
	my_array[i] = i;
}

btn_mc.onRelease = function():Void{
	var splicePosition:Number = Math.floor(Math.random()*my_array.length);
	var spliceValue = my_array.splice(splicePosition,1);
	trace(spliceValue);
};