jsp中JS问题

  function on_submit()
{
var bln = window.confirm("你确定运行吗?"); 
  if(bln == true)
  {
document.myform.submit();
return true;
  }
  else
  {
  document.myform.QuerySql.focus();
return false;
  }
  }
  </script>

<form name="myform" action="NewMusic.jsp" method="post" onsubmit="return on_submit()" >
  <table width="100%" border=1>
  <tr> <td>ID </td> <td>状态 </td> <td>保存路径 </td> <td>网站 </td> <td>获取数据总数 </td> <td>歌曲名排序 </td> <td>完成进度 </td> <td>操作 </td> </tr>
  <%
  Vector <MusicDb> vec = new Vector <MusicDb>();
  String strSql = "select * from music_switch";
  dbOperator.GetMusicSwitch(vec,strSql);
  for(int i=0;i < vec.size();i++)
  {
  out.print(" <tr>");
  out.print(" <td> <input type=\"hidden\" name=\"sjw_flag\" value=\"2\"> <input type=\"text\" name=\"switch_id\"contenteditable=\"false\" size=4 value=\"