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Jquery Validadion Plugin - Can someone help with a custom Validation!
<script>
function tdiff(t1,t2) {
    var t1 = hour2mins(t1);  var t2=hour2mins(t2);
    var ret = mins2hour(parseInt(t2-t1));
    if(t2<t1) {ret=mins2hour(parseInt(parseInt(t2+1440)-t1));}
    return ret;
}

$(function() {
$("input.[rel=time]").keyup(function (b){ $("#delaytime").val(tdiff($("#arrival").val(),$("#scharrival").val())); });
});

$().ready(function() {
    $.validator.addMethod('delayCode', function(value, element) {
    // ???!!!
    }, 'Please enter your a Delay Code');


    // validate signup form on keyup and submit
    $("#timetable").validate({
        rules: {
            arrival: { required: true},
            scharrival: { required: true}
        }
    });
});
</script>
<form id="timetable">
<table width="100%">
  <tr>
    <td><input type="text" name="arrival" id="arrival" rel="time"></td>
    <td><input type="text" name="scharrival" id="scharrival" rel="time"></td>
    <td><input type="text" name="delaytime" id="delaytime"></td>
    <td>
      <select name="delaycode" id="delaycode" class="required">
      <option value="">Select</option>
        <option value="01">01</option>
        <option value="02">02</option>
        <option value="03">03</option>
        <option value="04">04</option>
    </select></td>
  </tr>
</table>
</form>

arrival: { required: true},
        scharrival: { required: true}
        delaytime:{delayCode:true}
    }
});