织梦DEDE怎么实现上一篇下一篇翻页效果

<script>  <!--  document.onkeydown=nextpage;  var prevpage=&#39;{dede:prenext get=&#39;pre&#39;/}&#39;;  var nextpage=&#39;{dede:prenext get=&#39;next&#39;/}&#39;;  var index_page = "index.html";  //var bookpage="index.html";  function nextpage(event)  {  event = event ? event : (window.event ? window.event : null);  //if (event.keyCode==13) location=bookpage  if (event.keyCode==13) location=index_page  if (event.keyCode==37)  {  if (prevpage!=&#39;&#39; && prevpage!=&#39;上一篇：没有了 &#39;)  location=prevpage;  else  alert(&#39;这是第一页&#39;);  }  if (event.keyCode==39)  {  if (nextpage!=&#39;&#39; && nextpage!=&#39;下一篇：没有了 &#39;)  location=nextpage;  else  alert(&#39;已经是最后一页了&#39;);  }  }  //-->  function getElement(aID)  {  return (document.getElementById) ? document.getElementById(aID): document.all[aID];  }  function makeRequest(url){  http_request=false;  if(window.XMLHttpRequest){//Mozilla,Safari,...  http_request=new XMLHttpRequest();  if(http_request.overrideMimeType){  http_request.overrideMimeType(&#39;text/xml&#39;);  }  }else if(window.ActiveXObject){//IE  try{  http_request=new ActiveXObject("Msxml2.XMLHTTP");  }catch(e){  try{  http_request=new ActiveXObject("Microsoft.XMLHTTP");  }catch(e){}  }  }  if(!http_request){  alert(&#39;Giving up:(Cannot create an XMLHTTP instance)&#39;);  return false;  }  return http_request;  }  </script>