$(document).ready(function(){

  // Menu - sidebar
        
    $("#menu li ul").hide();
    $("#menu li a.current").parent().find("ul").slideToggle("slow");
    
    $("#menu li a.plain").click(
        function () {
            $(this).parent().siblings().find("ul").slideUp("normal");
            $(this).next().slideToggle("normal");
            return false;
        }
    );
        
    $("#menu li a.no-submenu").click(
        function () {
            window.location.href=(this.href);
            return false;
        }
    );

  // Efekt po najechaniu na menu
        
    $("#menu li .plain").hover(
        function () {
            $(this).stop().animate({ paddingRight: "25px" }, 200);
        },
        function () {
            $(this).stop().animate({ paddingRight: "15px" });
        }
    );

});

  <script type="text/javascript" src="js/script.js"></script>
  <script type="text/javascript" src="js/jquery/jquery-1.4.2.min.js"></script>

  <script type="text/javascript" src="js/jquery/jquery-1.4.2.min.js"></script>
  <script type="text/javascript" src="js/script.js"></script>