a href="％=request.serverVariables("Http_REFERER")％>">preivous page/a>或用圖片如：img src=http://www.host01.com/Get/asp/00010006/"arrowback.gif" alt="％=request.serverVariables("HTTP_REFERER")％>"> 

$url=$HTTP_SERVER_VARS["HTTP_REFERER"];      
  if($url)   {      
        $url_resource=$url;    
  }      
  else{      
      $url_resource="直接從瀏覽器輸入";      
  }