Jquery+Jquery-easyui的倒计时

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <link href="Script/jquery-easyui-1.3.2/themes/default/easyui.css" rel="stylesheet"
        type="text/css" />
    <link href="Script/jquery-easyui-1.3.2/themes/icon.css" rel="stylesheet" type="text/css" />
    <script src="Script/jquery-easyui-1.3.2/jquery-1.8.0.min.js" type="text/javascript"></script>
    <script src="Script/jquery-easyui-1.3.2/jquery.easyui.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        var oInterval = "";
        $(function () {
            oInterval = setInterval(CountDown, 1000);
        });

        function CountDown() {
            var count = $("#number").val();
            count--;
            if (count > 0) {
                $("#number").val(count);

            } else {
                clearInterval(oInterval);
                $("#mywin").window('close');

            };
        }
    </script>
</head>
<body>
    <div id="mywin" class="easyui-window" title="提示" style="width: 250px; height: 100px"
        minimizable="false" maximizable="false" closable="false" collapsible="false"
        data-options="iconCls:'icon-save',modal:true">
        <div class="easyui-layout" data-options="fit:true">
            <div data-options="region:'center'">
                正在加载预览内容，剩余时间<input type="button" id="number" value="10" disabled="disabled" />...
            </div>
        </div>
    </div>
</body>
</html>