javascript좀 봐주세요

Q1. 질문1<br/><br/>   <input type="radio" name="select1" value="0" onClick="sum()"> 1 (0점)<br/>   <input type="radio" name="select1" value="1" onClick="sum()"> 2 (1점)<br/>   <input type="radio" name="select1" value="2" onClick="sum()"> 3 (2점)<br/>   <input type="radio" name="select1" value="3" onClick="sum()"> 4 (3점)<br/><br/>  Q2. 질문2<br/><br/>   <input type="radio" name="select2" value="0" onClick="sum()"> 1 (0점)<br/>   <input type="radio" name="select2" value="1" onClick="sum()"> 2 (1점)<br/><br/>  Q3. 질문3<br/><br/>   <input type="radio" name="select3" value="0" onClick="sum()"> 1 (0점)<br/>   <input type="radio" name="select3" value="1" onClick="sum()"> 2 (1점)<br/><br/>  Q4. 질문4<br/><br/>   <input type="radio" name="select4" value="0" onClick="sum()"> 1 (0점)<br/>   <input type="radio" name="select4" value="1" onClick="sum()"> 2 (1점)<br/>   <input type="radio" name="select4" value="2" onClick="sum()"> 3 (2점)<br/>   <input type="radio" name="select4" value="3" onClick="sum()"> 4 (3점)<br/><br/>  Q5. 질문5<br/><br/>   <input type="radio" name="select5" value="0" onClick="sum()"> 1 (0점)<br/>   <input type="radio" name="select5" value="1" onClick="sum()"> 2 (1점)<br/><br/>  Q6. 질문6<br/><br/>   <input type="radio" name="select6" value="0" onClick="sum()"> 1 (0점)<br/>   <input type="radio" name="select6" value="1" onClick="sum()"> 2 (1점)<br/><br/>  총점 : <input type="text" name="txtSum" id="txtSum" value="0" readonly>   <script type="text/javascript">  function sum(){   var add1 = $(':radio[name="select1"]:checked').val();   var add2 = $(':radio[name="select2"]:checked').val();   var add3 = $(':radio[name="select3"]:checked').val();   var add4 = $(':radio[name="select4"]:checked').val();   var add5 = $(':radio[name="select5"]:checked').val();   var add6 = $(':radio[name="select6"]:checked').val();   var sum = (parseInt(add1) + parseInt(add2) + parseInt(add3) + parseInt(add4) + parseInt(add5) + parseInt(add6));   document.getElementById("txtSum").value = sum;  }   </script>