<tr>
    <td class="columnName">用戶名：</td>
    <td><input id="hTbxUserName" class="needCheck" type="text"/><span class="necessary">*</span></td>
</tr>

$('#hTbxUserName').jCallout(
    'initWithoutShow',{
        message: "必填項！",
        position: "right",
        backgroundColor: "#f00",
        textColor: "#fff",
        showEffect: "fade",
        showSpeed: 300,
        hideEffect: "fade",
        hideSpeed: 300,
        $closeElement: $('')
   });

var $userNameInput = $("#hTbxUserName");
$userNameInput.blur(function() {
    if($userNameInput.val().length==0){
        $userNameInput.jCallout('show');
    }
});

$closeElement: $('<span style="float: right; cursor: pointer">(X)</span>'),

message: "<img src='images/11.png'>必填項！"