My custome page

<?php
    $page_id = get_the_ID();
    $category = get_post_meta($page_id, 'category', true);
    if ($category) {
      $cat = $category;
      $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
      $post_per_page = 4; // -1 shows all posts
      $do_not_show_stickies = 0; // 0 to show stickies
    $args=array(
        'cat' => $cat,
        'orderby' => 'date',
        'order' => 'DESC',
        'paged' => $paged,
        'posts_per_page' => $post_per_page,
        'caller_get_posts' => $do_not_show_stickies
     );
      $temp = $wp_query;  // assign orginal query to temp variable for later use
      $wp_query = null;
      $wp_query = new WP_Query($args);
?>

<div id="post-container">
  <div id="posts">
    <div id="wall-title">Notes</div>
    <div class="post-list">
<?php  if( have_posts() ) :
        while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
      <div class="post" id="post-<?php the_ID(); ?>">
        <div class="post-gravatar"> <a href="<?php echo get_author_posts_url($authordata->ID); ?>"><?php echo get_avatar(get_the_author_email(), '50') ?></a> </div>
        <div class="post-text">
          <h2 class="title"><a href="<?php the_permalink(); ?>" rel="bookmark">
            <?php the_title(); ?>
            </a></h2>
            <div class="meta">
                <?php the_time('j F Y'); echo ' at '; the_time('H:i'); ?>
            </div>
          <?php the_content(' &hellip;'); ?>
          <div class="meta">
            <a href="<?php the_permalink(); ?>" rel="bookmark">View Full Note</a> &middot; <a href="<?php the_permalink(); ?>#respond" class="respondlink notajax" id="respondlink-<?php echo $post->ID; ?>">Comments</a>
            <?php edit_post_link('Edit', ' &middot; ', '') ?>
          </div>