function isIE()
    {
        return /msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent);
    }
        
    function isFF() {
      return /firefox/i.test(navigator.userAgent);
    }

    function bookmarkit(bookmark_title)
    {		    
      if (isIE()==true) {
        var correctbook = "window.external.AddFavorite('" + location.href + "','" + bookmark_title + "')";
      } else if (isFF()==true)  {
        var correctbook = "window.sidebar.addPanel('" + bookmark_title + "','" + location.href + "','')";
      } else {
        var correctbook = "alert('Press [COMMAND/CTRL]+D to add '" + bookmark_title + "' to your favourites.')";
      }

      links_line = '<a href="javascript:' + correctbook + '" id="favorite" class="social_networking">Bookmark This Site</a>';	
			return links_line;
    }