$(function () {

    $('#category').change(function () {
        window.location = $(this).val();
    });

    $('#author').change(function () {
        window.location = $(this).val();
    });

    $('#search_by_rating').change(function () {
        window.location = $(this).val();
    });

    $('.b-search-field').focus(function () {
        $(this).val('');
    });
    $('.b-search-field').focusout(function () {
        $(this).val('Поиск');
    });

});