你的代码问题不少..<script>
function  switch1()
{
    if(window.i=="1"){
    window.open("findpwd_3_tomobile.htm","发送密码至手机","");
    }
    else{
    window.open("toEmai.htm","发送密码至邮箱","")
    }
}
document.onclick=function()
{
    if(event.srcElement.checked)
window.i=event.srcElement.value;
}
</script>
<form name="fomsendtype" onsubmit="switch1()"><input type="radio" name="sendtype" value="1">
          发送到我注册的手机上 </td>
        <td align=middle class=itemname height="12"> <div align="center"> </div></td>
      </tr>
      <tr> 
        <td align=middle class=itemname width="160" height="12"><input type="radio" name="sendtype" value="2">
          发送到我注册的信箱中 </td>
<input type="submit">