[destus]

<input name="premium" id="premium" type="checkbox">
<label class="label_check" for="premium">Показать</label>

$(function(){
	$('#premium').click(function(){
		var url = '';
		if($('#premium').prop('checked')) {
			url = '/catalog/?category=premium';
		} else {
			url = '/catalog/';
		}
		$.ajax({
			type: "POST",
			url: url,
			success: function(data) {
				$('#ct-blocks').html(data);
		  }
		});
	});
});