js滚动条动态加载数据

    <!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" lang="zh-CN">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <script type="text/javascript" src="http://www.miiceic.org.cn/templets/js/jquery-1.3.1.js"></script>
    <title>企业培训，it培训，数据库培训，android培训，嵌入式培训</title>
    </head>
       <script type="text/javascript">
        function insertcode(){
            var $body = $("body");
            $body.append('<div style=\" height:1000px; font-size:24px;\"><a href=\"http://www.miiceic.org.cn/\" target=\"_blank\">企业培训</a><br /><a href=\"http://www.amboedu.com/\" target=\"_blank\">职业教育</a><br /><a href=\"http://www.ciitn.com/\" target=\"_blank\">信息产业培训网</a><br /><a href=\"http://www.miiceic.org.cn/amt2011/\" target=\"_blank\">android PK Iphone</a><br /></div>')
            $("#page_tag_load").hide();
            }
        function endcode(){
            $("#page_tag_load").hide();
        }
        $(document).ready(function(){
             $(window).scroll(function () {
                  var $body = $("body");
                  var $html = "";
                  $html += "<br/>" + ($(window).height() + $(window).scrollTop());
                  $html += "<br/>window.height: " + $(window).height();
                  $html += "<br/>body.height: " + $body.height();
                  $html += "<br/>window.scrollTop: " + $(window).scrollTop();
                  $("#page_tag_bottom").html($html);

                 /*判断窗体高度与竖向滚动位移大小相加是否超过内容页高度*/
                  if (($(window).height() + $(window).scrollTop()) >= $body.height()) {
                      $("#page_tag_load").show();
                      //setTimeout(insertcode, 1000);/*IE 不支持*/
                      if(($(window).height() + $(window).scrollTop())<3000){
                          insertcode();
                      }
                      else{
                          endcode();
                      }
                  }
              });
          });
        </script>
    </head>

    <body>
        <div style="height:1000px; font-size:24px;"><a href="http://www.miiceic.org.cn/" target="_blank">企业培训</a><br /><a href="http://www.amboedu.com/" target="_blank">职业教育</a><br /><a href="http://www.ciitn.com/" target="_blank">信息产业培训网</a><br /><a href="http://www.miiceic.org.cn/amt2011/" target="_blank">Android PK Iphone</a><br /><br /><br /><a href="http://www.miiceic.org.cn/amt2011/" target="_blank">跨领域技术体验峰会</a></div>
        <div id="page_tag_bottom" style="100%; position:fixed; _position:absolute;top:0px; background-color:#cccccc;height:120px;"></div>
        <div id="page_tag_load" style=" display:none; font-size:14px;position:fixed; bottom:0px; background-color:#cccccc;height:50px;">加载中...</div>
    </body>
    </html>