menu scrolling and activation for id

// menu scrolling and activation for id
var lastId,
    topMenu = jQuery("#top-navigation"),  // here  #top-navigation is id of <ul id="top-navigation"></ul>
    topMenuHeight = topMenu.outerHeight()+15,
    menuItems = topMenu.find('a[href^="#"]'),
    scrollItems = menuItems.map(function(){
      var item = jQuery($(this).attr("href"));
      if (item.length) { return item; }
    });
    menuItems.click(function(e){
    var href = jQuery(this).attr("href"),
    offsetTop = href === "#" ? 0 : $(href).offset().top-topMenuHeight+1;
   jQuery('html, body').stop().animate({
    scrollTop: offsetTop
    }, 300);
    e.preventDefault();
    });
    jQuery(window).scroll(function(){
    var fromTop = $(this).scrollTop()+topMenuHeight;
    var cur = scrollItems.map(function(){
    if ($(this).offset().top < fromTop)
       return this;
    });
    cur = cur[cur.length-1];
    var id = cur && cur.length ? cur[0].id : "";
    if (lastId !== id) {
    lastId = id;
    menuItems
    .parent().removeClass("active")
    .end().filter("[href=#"+id+"]").parent().addClass("active");
    }
});




// for wordpress memu

<?php wp_nav_menu( array( 'theme_location' => 'plutin_menu_blog','menu_id' => 'top-navigation', ) ); ?>