<script type="text/javascript">
//initialize page divs
$('#page-1').css('display', 'none');
$('#page-2').css('display', 'none');
</script>
<?php
if(isset($_GET['page'])){
    $page = $_GET['page']; ?>
    <script type="text/javascript">
        $('#page-<?php echo $page; ?>').css('display', 'block');
    </script><?php
} else {
    $page = "1"; ?>
    <script>
        $('#page-<?php echo $page; ?>').css('display', 'block');
    </script><?php
}
?>

<div id="article-page page-". $page_num ."">

<div id="article-page page-1">