[danik.js]

var items = $('ul.pagination').children();
var index = 0;
$('.next, .prev').click(function(e){
    items.eq(index).removeClass('active');
    if (this.className == 'next')
        index = (index == items.length-1) ? 0 : ++index;
    else 
        index = (index == 0) ? items.length-1 : --index;
    items.eq(index).addClass('active');
    e.preventDefault();
});