function changeRate(plusOrMinus, postId) { //1 = + | 2 = -
    $.ajax({
        url: '/blogs/changeRate',
        dataType : 'html',
        type : 'post',
        data: 'p='+plusOrMinus+'&postId='+postId,
        success: function (data) {
            $('.rt'+postId).html(data);
            $('.rdown'+postId).attr("src","/images/downB.png");
            $('.rup'+postId).attr("src","/images/upB.png");
        }
    });
}