jQuery: Remove class if other element is clicked

You can use siblings and removeClass methods.

$('li').click(function() {
    $(this).addClass('active').siblings().removeClass('active');
});

http://jsfiddle.net/Lb65e/

This will remove the active class from each li that have active and than will add to the Element which was clicked.

$('body').on('click', 'li', function() {
      $('li.active').removeClass('active');
      $(this).addClass('active');
});