jQuery validate and groups - how to avoid errorPlacement usage?

本文参照：

 

指定错误提示的位置

<form id="myform">
  first name: <input type="text" name="fname" id="fname"/><br>
  last name: <input type="text" name="lname" id="lname"/><br>

    <input type="submit"/>
</form>​

and this validate code:

$("#myform").validate({
    rules: {
        fname: { required: true },
        lname: { required: true }
    },
  groups: {
    username: "fname lname"
  },
  errorplacement: function(error, element) {
     if (element.attr("name") == "fname" 
                 || element.attr("name") == "lname" )
       error.insertafter("#lname");
     else
       error.insertafter(element);
   }
 })​