public int findEmptyPlayerID() {
		if(this.empty_ids.equals("")) {
			for(int k=0;k!=256;k++) {
				this.empty_ids = this.empty_ids + "-" + k+"~";
			}
		}
		
		for(int k=0;k!=256;k++) {
			if(this.empty_ids.contains("-"+k+"~")) {
				this.empty_ids = this.empty_ids.replace("-"+k+"~", "");
				return k;
			}
		}
		
		return -1;
	}