jquery实现上一页 下一页

本例为多张图片，只显示一张，相册翻页效果，上一页，下一页，当前页码和总页码 

<img src="img/3.gif" alt="" id="cur_img">

<div class="galleryPaging">
    <a href="javascript:void(0)" id="LastPage">上一页</a>
    <span><em id="pageindex">1</em>/<em id="totalnum">1</em></span>
    <a href="javascript:void(0)"  id="NextPage">下一页</a>
</div>

var photoimg_str=[{img: 'http://img.oss.shuihulu.com/topic/a224727e07f24c83b41d346e5fe86d41.jpg@600w_1l_95Q'},{img: 'http://img.oss.shuihulu.com/topic/3197a591003e489db0001ad1002ea7f8.jpg@600w_1l_95Q'},{img: 'http://img.oss.shuihulu.com/topic/a58fcc565eca44a89a958552f1724f96.jpg@600w_1l_95Q'},{img: 'http://img.oss.shuihulu.com/topic/3e130f3593c0460586b61c7775c1b7e0.jpg@600w_1l_95Q'},{img: 'http://img.oss.shuihulu.com/topic/e420d9c3f48e4bca8d8ba93c0460727d.jpg@600w_1l_95Q'},{img: 'http://img.oss.shuihulu.com/topic/6231600de694438a99c9bd5bb813852b.jpg@600w_1l_95Q'}];

  $("#totalnum").html(photoimg_str.length);
    $("#cur_img").attr("src",photoimg_str[0].img);
    $("#NextPage").click(function(){
         if(parseInt($("#hid_index").val())< parseInt(photoimg_str.length)-1)
         {
       $("#hid_index").attr("value",parseInt($("#hid_index").val())+1);
       $("#cur_img").attr("src",photoimg_str[parseInt($("#hid_index").val())].img);
        $("#pageindex").html(parseInt($("#hid_index").val())+1);
       }
    });
   $("#LastPage").click(function(){
     if(parseInt($("#hid_index").val())>0)
     {
     $("#hid_index").attr("value",parseInt($("#hid_index").val())-1);
       $("#cur_img").attr("src",photoimg_str[parseInt($("#hid_index").val())].img);
        $("#pageindex").html(parseInt($("#pageindex").html())-1);
}
   
    });