 <script>
         var currentItem = "link_1";
         function Navigation(Id) {
            
            var CssClassActive = "menu1b:active";
            var CssCLassInactive = "menu1b:visited";
            
            // Altem Item inaktive Klasse zuweisen
            if(currentItem != "") {
               document.getElementById(currentItem).className = CssCLassInactive;
            }
            
            // Neuem Item aktive Klasse zuweisen
            document.getElementById(Id).className = CssClassActive;
            
            // Neues Item merken
            currentItem = Id;
            
         }
      </script>
	  <style>
        .menu1b:active { color: #dc2b19;}
       .menu1b:visited { color: #CC0000;}
      </style> 