红色标记的那两行，老是提示缺少对象：

    function showList(xmlDoc){


           [color=FF0000]   var currentPage = xmlDoc.childNodes[0].firstChild.firstChild.nodeValue;
              var total = xmlDoc.childNodes[0].firstChild.nextSibling.firstChild.nodeValue;[/color]
              if(currentPage>1){
                        document.getElementById('lastPage').innerHTML='<a href="javascript:void(0)" onclick=queryPage('+(parseInt(currentPage)-1)+')><上一页</a>';
              }else{
                        document.getElementById('lastPage').innerHTML='';
              }
              if(currentPage!=total){
                        document.getElementById('nextPage').innerHTML='<a href="javascript:void(0)" onclick=queryPage('+(parseInt(currentPage)+1)+')>下一页></a>';
              }else{
                        document.getElementById('nextPage').innerHTML='';
              }
              document.getElementById('currentPage').innerHTML='当前页：'+currentPage;
              document.getElementById('total').innerHTML='总页数：'+total;
              var lists = xmlDoc.childNodes[0].childNodes[2].childNodes;
              var tbody = document.getElementsByTagName('tbody')[0];
                        tbody.innerHTML='<tr><th>标题</th><th>摘要</th></tr>';
              for(i=0;i<lists.length;i++){
                        var title = lists[i].firstChild.firstChild.nodeValue;
                        var abstract = lists[i].firstChild.nextSibling.firstChild.nodeValue;
                        appendRow(title,abstract);
              }
    }


相对应的XML文件为：

Content-Type: text/xml;charset=gb2312

<content>
<currentpage>1</currentpage><total>4</total>
<lists>
<list>
<title>1001</title><abstract>成员一</abstract>
<title>1002</title><abstract>成员二</abstract>
</list>
</lists>
</content>