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$(document).ready(function() {    
    var scrollLink = $('.scroll');    
    // Smooth scrolling
    scrollLink.click(function(e) {
      e.preventDefault();
      $('body,html').animate({
        scrollTop: $(this.hash).offset().top
      }, 1000 );
    });    
    // Active link switching
    $(window).scroll(function() {
      var scrollbarLocation = $(this).scrollTop();      
      scrollLink.each(function() {        
        var sectionOffset = $(this.hash).offset().top - 20;        
            if ( sectionOffset <= scrollbarLocation ) {
                $(this).parent().addClass('active');
                $(this).parent().siblings().removeClass('active');
            }
      });
      
    });    
});