$(function(){
$.localScroll();
//updateActiveMenu();
setInterval(updateActiveMenu, 330);
});

var prevScroll = 0;
var menuMap = [{menuClass : 'main_menu', blockClass: 'main'}, {menuClass : 'who', blockClass: 'about'}, {menuClass : 'teacher_menu', blockClass: 'teacher'}, {menuClass : 'contact', blockClass: 'contacts'} ];

function updateActiveMenu(){
	var scroll = $(window).scrollTop();
	
	if (scroll == prevScroll) return;
	
	prevScroll = scroll; //save
	
	var activeIndex = 0;
	
	for(var i=0; i<menuMap.length; i++){
		var r = $("."+menuMap[i].blockClass).offset();
		if (scroll+50>r.top) activeIndex = i;
	}
	
	if($("#nav-primary li."+menuMap[activeIndex].menuClass+" a.current").size()>0) return;
	
	$("#nav-primary a.current").removeClass("current");
	$("#nav-primary li.pointer").removeClass("pointer");
	
	$("#nav-primary li."+menuMap[activeIndex].menuClass).addClass("pointer");
	$("#nav-primary li."+menuMap[activeIndex].menuClass+" a").addClass("current");
}