il funzionamento è abbastanza semplice... associa ai link una classe
mese_1, mese_2... ecc...


codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="it" xml:lang="it">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
        <title>xhtml 1.0</title>
        
        
        <script type="text/javascript">
        // <![CDATA[
       
        function showOnlyCurrentMonthLink() {
        
            mCur = ((new Date).getMonth())+1;
            l = document.getElementsByTagName('a');
            
            for (i=0; i<l.length; i++) {
                mLink = l[i].className.match(/\d+$/);
                l[i].style.display = (mLink == mCur)? 'block' : 'none';
            }
        
        }
        
        window.onload = showOnlyCurrentMonthLink;

        // ]]>
        </script>
    </head>

<body>


Set
Ott
Nov


</body>
</html>
Può andare?