var current = 0;
var maxPages = 0;
$(document).ready(function() {
	// retrieve initial comment list
	$('#comment_list').load('ajax_guestbook.php');
	$.getJSON('ajax_guestbook.php?action=gettotal', function(data) { maxPages = data.maxPages; });
	$('#previousPage').hide();
	$('#nextPage').click(function() {
		if (current < maxPages) {
			current++;
			if (current != 0) { $('#previousPage').show(); }
			if (current == maxPages) { $('#nextPage').hide(); }
			$('#comment_list').empty();
			$('#comment_list').append('<img src="img/loading.gif" alt="Loading..." class="center_image" />');
			$('#comment_list').load('ajax_guestbook.php?p=' + current);
		}
	});
	$('#previousPage').click(function() {
		if (current > 0) {
			current--;
			$('#comment_list').empty();
			$('#comment_list').append('<img src="img/loading.gif" alt="Loading..." class="center_image" />');
			$('#comment_list').load('ajax_guestbook.php?p=' + current);
			if (current == 0) { $('#previousPage').hide(); }
			if (current != 1) { $('#nextPage').show(); }
		}
	});
});