$(function(){

    $('a[href*=#]').click(function() {
    
    if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') 
        && location.hostname == this.hostname) {
        
            var $target = $(this.hash);
            
            $target = $target.length && $target || $('[name=' + this.hash.slice(1) +']');
            
            if ($target.length) {
            
                var targetOffset = $target.offset().top;
                
                $('html,body').animate({scrollTop: targetOffset}, 600);
                    
                return false;
                
            }
            
        }
        
    });

    var $mainNav   = $("#mainNav"),
        $window    = $(window),
        offset     = $mainNav.offset(),
        topPadding = 0;

    $window.scroll(function() {
        if ($window.scrollTop() > offset.top) {
            $mainNav.stop().animate({
                marginTop: $window.scrollTop() - offset.top + topPadding
            });
        } else {
            $mainNav.stop().animate({
                marginTop: 0
            });
        }
    });

});