ช่วยแนะนำหน่อยค่ะ คือจะตรวจradio button และให้มันกรอกค่าใน textbox

<script language="javascript">
  function fncSubmit()
{
if(document.formsr.choice1.checked == false && document.formsr.choice2.checked == false && document.formsr.choice3.checked == false && document.formsr.choice4.checked == false){  // ถ้าไม่เลือกเลย ซะหัวข้อ
          alert('Please choose some radio.');
        return false;
	    }
        if(document.formsr.choice1.checked==true && document.formsr.rubber1_2.value.length<=0){  //1
            alert('If you choose Rubber Mastication, you should enter ML(1+4)100 and Rubber mastication.');
			document.formsr.rubber1_2.focus(); 
            return false;
        }
		 if(document.formsr.choice2.checked==true && document.formsr.rubber1_2.value.length<=0){  //2
            alert('If you choose Rubber Mixing, you should enter Rubber mastication.');
			document.formsr.rubber1_2.focus(); 
            return false;
		 }
		 if(document.formsr.choice3.checked==true && document.formsr.rubber3_4a.value.length<=0){  //3
            alert('you should enter Rubber Material ,Product name and Shipping Date.');
			document.formsr.rubber3_4a.focus(); 
            return false;
		 }
		 if(document.formsr.choice4.checked==true && document.formsr.rubber3_4a.value.length<=0){  //4
            alert('If you choose Inspection, you should enter  Rubber Material ,Product name and Shipping Date.');
			document.formsr.rubber3_4a.focus(); 
            return false;		
        }
        document.formsr.submit();
        return false;
        }
   </script>