jquery 只能投票一次

最近帮朋友写了一个投票的东西，根据cookie来判断，只能投票一次，下面贴上代码：
<html>
<head>
    <title>test</title>

    <script  type="text/javascript" src="jquery-132min2.js" ></script>
    <script  type="text/javascript" src="Jquery-cookie.js" ></script>

    <script type="text/javascript">
    document.oncontextmenu = function(){return false;}  
    $(document).ready(function()
    {
        if (document.cookie && document.cookie != '') {
            var cookies = document.cookie.split(';');
            for (var i = 0; i < cookies.length; i++) {
                var cookie = jQuery.trim(cookies[i]);
                var id = cookie.substring(cookie.indexOf('=')+1);
                $("#vote-up-"+id).attr("disabled","disabled");
                $("#vote-dn-"+id).attr("disabled","disabled");    
            }
        }
    });
    
    function votes(id,num)
    {
        var cookieName  = $.cookie('isClick'+id);
        if(cookieName == id)  return;       
        var posscore = parseInt($('#up-'+id).text()),
        negscore = parseInt($('#dn-'+id).text()),
        d = (num>0?'up':'dn');
        num>0 ? posscore++ : negscore--;
        var val= 0;
        if(num >0)
            val = posscore;
        else
            val = negscore;
        $("#"+d+"-"+id).html(val);
        showAnimation(d+'-'+id, num);
//        $("#vote-up-"+id).removeClass("");
//        $("#vote-up-"+id).addClass("");
//        $("#vote-dn-"+id).removeClass("");
//        $("#vote-dn-"+id).addClass("");
        $("#vote-up-"+id).attr("disabled","disabled");
        $("#vote-dn-"+id).attr("disabled","disabled");    
        $.cookie('isClick'+id,id);    
    }
    
    function showAnimation(containerId, actionValue){
    var obj = $('#'+containerId),
        pos = obj.offset(),
        ani = $('<div id="vote-ani" style="font-size:24px;z-index:1000;">'+(actionValue > 0 ? "+1" : "-1")+"</div>");
    ani.appendTo('body');
     $("#vote-ani").css
    (
        {
            top: pos.top+10
            , left: pos.left+10
            ,display: 'block'
            ,position: 'absolute'
        }
    );
    $("#vote-ani").animate({opacity: 0, left: "-=10px", top: "-=10px"}, 500, 'linear', function(){ani.remove()});
}

    </script>

</head>
<body>
    <div class="bar clearfix" id="qiushi_counts_4283026">
        <div class="up" id="vote-up-4282280">
            <a href="javascript:votes(4282280,1)" id="up-4282280">1574 </a>
        </div>
        <div class="down" id="vote-dn-4282280">
            <a href="javascript:votes(4282280,-1)" id="dn-4282280">-55 </a>
        </div>
    </div><br />
       <div class="bar clearfix" id="Div1">
        <div class="up" id="vote-up-4282281">
            <a href="javascript:votes(4282281,1)" id="up-4282281">11 </a>
        </div>
        <div class="down" id="vote-dn-4282281">
            <a href="javascript:votes(4282281,-1)" id="dn-4282281">-11 </a>
        </div>
    </div>
</body>
</html>
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