ajax problem

hello, guys!

First of all I want to say thanks for such good theme!

In one of my projects, I need to create dynamic archive of one of the categories.
I search for a right plugin for a long time. But I can’t find them.
But I find some solution.

template for page:

<?php
/*
	Template Name: Шаблон архивов
*/
?>

<?php get_header(); ?>

<style type="text/css" rel="stylesheet" >
#archive_browser > div { display: inline-block; padding-right: 10px; }
#archive_pot { min-height:150px; }
#archives_table { border-collapse:collapse; margin:15px 0 0 0; width:100%; }
#archives_table td { min-height:25px; padding:4px; border-top:1px solid #eee; border-bottom:1px solid #eee; }
</style>

<script type="text/javascript">
(function($){
	$(function(){

		$("#archive_browser select").change(function(){
			$("#archive_pot")
	.empty()
	.html("<div style='text-align:center; padding:30px;'><img src='<?php bloginfo('template_url') ?>/images/ajax-loader.gif' /></div>");
	var dateArray = $("#month-choice").val().split("/");
			var y = dateArray[3];
			var m = dateArray[4];
			var c = $("#cat").val();
	$.post(
	"<?php bloginfo('template_url') ?>/scripts/archive_getter.php",
	{
		year : y,
		month : m,
		cat : c
	},
	function(data) {
		$("#archive_pot").html(data).animate({ height: $("#archives_table").height()+40 });
	}
	);
		});
	});
})(jQuery)
</script>

<div id="archive_browser">
	<div>
		<h4>Месяцы</h4>
		<select id="month-choice">
			<option val="no-choice"> — </option>
			<?php wp_get_archives(array(
	'type' => 'monthly',
	'format'  => 'option'
			)); ?>
		</select>
	</div>
	<div>
		<h4>Рубрики</h4>
		<?php wp_dropdown_categories('show_option_none= -- '); ?>
	</div>
</div>

<div id='archive_pot'></div>

<?php get_footer(); ?>

GETTER:

<?php 

// подгружаем среду WP
require($_SERVER['DOCUMENT_ROOT'].'/wp-load.php');

// фильтруем POST данные, передаваемые этому файлу с Javascript
$year = htmlspecialchars(trim($_POST['year']));
$month = htmlspecialchars(trim($_POST['month']));
$cat = htmlspecialchars(trim($_POST['cat']));

?> 

<table id="archives_table">
	<?php
	if( ($year=='') && ($month=='') && ($cat=='-1') ){
		echo "<tr><td style='text-align: center; font-size: 15px; padding: 5px;'>Пожалуйста, выберите дату/категорию из списка выше.</td></tr>";
	}
	else
	{
		// Получаем данные с помощью query_posts
		query_posts("posts_per_page=-1&cat=$cat&monthnum=$month&year=$year");
		// выводим данные в Цикле WordPress
		if( have_posts() ){ while( have_posts() ){ the_post(); ?>
			<tr>
	<td><a href='<?php the_permalink(); ?>'><?php the_title(); ?></a></td>
	<td><?php comments_popup_link(' ', '1 Комментарий', '% Комментариев'); ?></td>
	<td><?php the_time('j.m.Y'); ?></td>
			</tr>
			<?php
		}}
		else // Если постов нет
			echo "<tr><td style='text-align: center; font-size: 15px; padding: 5px;'>Ничего не найдено.</td></tr>";
	} ?>
</table>

AND code that I put to ajax-hendler.php

function my_scripts_method() {
	wp_deregister_script( 'jquery' );
	wp_register_script( 'jquery', '//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js');
	wp_enqueue_script( 'jquery' );
}    

add_action( 'wp_enqueue_scripts', 'my_scripts_method' );

It was some problems with russian symbols, I solve this problem by changing windows to utf-8 in ajax-hendler.

In page template I write category that I need in query_posts.

But I have problem. After month choosing, page show posts for needed category, but for all dates – all posts in this category. I try to switch month and year, but page show all posts again.

I try to change date formats in wordpress setting, but nothing…

Help please….