//A Di Da Phat
	//Code nay duoc dung de xuwng duwowng Tinh Do
	//Neu khong vi muc dich do, xin Chu vi dung dung code nay
	//Tac gia: http://gdpthoaihai.org

	hienThiDapAn = false;
	lamLaiTuDau = false;
	function lamLai(){
		lamLaiTuDau = true;
		ketQua();
		lamLaiTuDau = false;
	}
	function dapAn(){
		hienThiDapAn = true;
		ketQua();
		hienThiDapAn = false;
	}
	function ketQua(){
		for (i=1; document.getElementById("noiDung_"+i)!=null; i++){
			ketQua_NoiDung("noiDung_"+i);
		}
	}
	function ketQua_NoiDung(noiDungName){
		for (j=1; document.getElementById(noiDungName+"_CauHoi_"+j)!=null; j++){
			ketQua_CauHoi(noiDungName+"_CauHoi_"+j);
		}
	}
	function ketQua_CauHoi(cauHoiName){
		for (k=1; document.getElementById(cauHoiName+"_PhuongAn_"+k); k++){
			ketQua_PhuongAn(cauHoiName+"_PhuongAn_"+k, "_"+k+"_", cauHoiName+"_KetQuaDung", cauHoiName+"_VanBan_"+k, cauHoiName+"_LyGiai_"+k);
		}
	}
	function ketQua_PhuongAn(traLoi, phuongAnId, ketQua, vanBan, lyGiai){
		objTraLoi = document.getElementById(traLoi);
		objKetQua = document.getElementById(ketQua);
		objVanBan = document.getElementById(vanBan);
		objLyGiai = document.getElementById(lyGiai);

		err = "";
		if (objTraLoi == null){err = traLoi + "\n"}
		if (objKetQua == null){err = err + ketQua + "\n"}
		if (objVanBan == null){err = err + vanBan + "\n"}
		if (err != ""){
			alert("Khong tim thay:\n" + err);
			return;
		}

		if (lamLaiTuDau){
			objTraLoi.checked = false;
			objVanBan.style.color = "black";
		}
		
		if (hienThiDapAn){
			if (objKetQua.value.indexOf(phuongAnId)>=0){
				objVanBan.style.color = "green";
				objVanBan.innerHTML = objVanBan.innerHTML + "<img src =http://gdptculai.com/images/check.gif>";
			}
		}else{
			if (objTraLoi.checked || objTraLoi.selected){
				if (objKetQua.value.indexOf(phuongAnId)>=0){
					objVanBan.style.color = "blue";
					objVanBan.innerHTML = objVanBan.innerHTML + "<img src =http://gdptculai.com/images/dung.gif>";
				}else{
					objVanBan.style.color = "red";
					objVanBan.innerHTML = objVanBan.innerHTML + "<img src =http://gdptculai.com/images/sai.gif>";
				}
			}
			if (!objTraLoi.checked && (objTraLoi.type == "checkbox")){
				if (objKetQua.value.indexOf(phuongAnId)>=0){
					objVanBan.style.color = "red";
					objVanBan.innerHTML = objVanBan.innerHTML + "<img src =http://gdptculai.com/images/dung.gif>";
				}
			}
		}
	}