if (window.sidebar) {      // FF
   document.writeln('<a href=javascript:window.sidebar.addPanel("PROMEX","http://promex.rybnik.pl","") class="menu-dolne"><span class=kropy></span>Dodaj do ulubionych</a>');
   }
   else if (window.external) {   // IE
        document.writeln("<a href=\"javascript:window.external.addfavorite('http://promex.rybnik.pl', 'PROMEX');\" class=\"menu-dolne\"><span class=kropy></span>Dodaj do ulubionych</a>");
        }
        else if (window.opera) {   // Opera
             document.writeln('<a href="http://promex.rybnik.pl" title="PROMEX" rel="sidebar" class="menu-dolne"><span class=kropy></span>Dodaj do ulubionych</a>');
        }