How to install for dummy?

one or two / == same problem

Not Found

The requested URL /admin/editor/fckeditor.html was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

here is my code:

   <link href="../fckeditor/_samples/sample.css" rel="stylesheet" type="text/css" />
   <script type="text/javascript" src="../fckeditor/fckeditor.js"></script>
      <script type="text/javascript">
<!--
// Automatically calculates the editor base path based on the _samples directory.
// This is usefull only for these samples. A real application should use something like this:
// oFCKeditor.BasePath = '/fckeditor/' ;   // '/fckeditor/' is the default value.
var sBasePath = document.location.href.substring(0,document.location.href.lastIndexOf('_samples')) ;

var oFCKeditor = new FCKeditor( 'FCKeditor1' ) ;
oFCKeditor.BasePath   = sBasePath ;
oFCKeditor.Height   = 300 ;
oFCKeditor.Value   = '<p>This is some <strong>sample text<\/strong>. You are using <a href="http://www.fckeditor.net/">FCKeditor<\/a>.<\/p>' ;
oFCKeditor.Create() ;
//-->
      </script>