Dreamweaver でキーボードの方向キーを押して前の記事を次の記事に移動する方法

$this->PreNext[&#39;pre&#39;] = "上一篇：<a href=&#39;$mlink&#39;>{$preRow[&#39;title&#39;]}</a> ";

$this->PreNext['pre'] = "$mlink ";
$this->PreNext[&#39;next&#39;] = "下一篇：<a href=&#39;$mlink&#39;>{$nextRow[&#39;title&#39;]}</a> ";

<script type="text/javascript" language="javascript">
 < !--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) {
  eventevent = 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>