Insert something from a dialog

I have made a dialogbox, but how do insert it into the editor...

I have this script in the dialog.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>
<head>
   <title></title>
<link rel="stylesheet" type="text/css" href="../scripts/WorkArea.css">
<META HTTP-EQUIV=PRAGMA CONTENT="NO-CACHE">
<SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">
<!--

function insertLink(url)
   {
   var oName=dialogArguments.oUtil.oName;
   eval("dialogArguments."+oName).insertLink(url);

   parent.window.close();
   }

//-->
    </SCRIPT>

   </head>





<body>

<b><font face="Verdana" size="2">
Vlg en side eller en mappe:</font></b><br><br>
<a href="javascript:insertLink('whois.asp')">Whois</a>
</body>
</html>

What I wanted was to mark som text in the fckeditor, and push the button, which brings up the dialogbox, and pick the link I made there, and it makes the text I have selected in the editor to a link. Is it possible....

The insertlink, you see is taken fra another cms.

CKEditor 4

Insert something from a dialog