$(document).ready(function() {
    $('.tabbed-content div').hide(); // Hide all divs
    $('.tabbed-content div:first').show(); // Show the first div
    $('.tabbed-content ul li:first').addClass('on'); // Set the class of the first link to active
    $('.tabbed-content ul li a').click(function() { //When any link is clicked

    $('.tabbed-content ul li').removeClass('on'); // Remove active class from all links
        $(this).parent().addClass('on'); //Set clicked link class to active
        var currentTab = $(this).attr('href'); // Set variable currentTab to value of href attribute of clicked link
        $('.tabbed-content div').hide(); // Hide all divs
        $(currentTab).fadeIn(1000); // Show div with id equal to variable currentTab
        return false;
        event.preventDefault();
    });
});