Nevermind, it actually works.

Code HTML4Strict:
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
 
 
        <script language="JavaScript">
        <!--
        function openWin()
        {
        window.open('form.htm','FloatingWindowTab','
        width=620,height=30,toolbar=no,directories=no,
        status=no,scrollbar=no,resize=no,menubar=no');
        }
        //-->
        </script>
 
 
</head>
 
<body>
 
    <a href="javascript:openWin()">Floating window demo</a> 
</body>
</html>