PHP search form, show results on load

<?php
session_start();
if(isset($_POST['search'])){
$_SESSION['country']=$_POST['country'];
$_SESSION['work']=$_POST['work'];
}
if(isset($_POST['reset'])){
if(isset($_SESSION['country'])){
unset($_SESSION['country']);
}
if(isset($_SESSION['work'])){
unset($_SESSION['work']);
}
} 
/* Template Name: custom Chain*/
get_header();

?>
<section id="container">
	<?php if(!is_home() && !is_front_page() && get_option('afl_breadcrumbs_enable') == 'open'):?>
    <!--breadcrumbs -->
    <section class="container">
        <div class="container breadcrumbs">
            <div class="page-header">
            <h1><?php the_title();?></h1>
            <div><?php echo get_option('breadcrumbs_text'); ?><a href="<?php echo home_url(); ?>"><?php echo BREADCRUMBS_HOME_TEXT ?></a><?php echo BREADCRUMBS_DIVIDER ?><?php the_title();?></div>
			</div>
        </div>
    </section>
	<?php endif; ?>
	
	<div class="container">
        <div class="row-fluid">
<?php
$args = array(
  'child_of' => 59,
  'hide_empty' => 0
  );

$categories=get_categories($args);
?>
<form action="" method="post">
<div style="float: left; min-width: 25%">
	<label>Area</label>
	<select name="zone" onchange="this.form.submit()">
	<option value="59">Tutte</option>
	<?php
	foreach($categories as $category) { 
	if($category->parent == 59 ){ ?>

	<option value="<?php echo $category->term_id; ?>" <?php if($_POST['zone'] == $category->term_id){ ?> selected <?php } ?> ><?php echo $category->name; ?></option>
	<?php
	} 
	} 
	?></select> 
</div>

<?php if(isset($_POST["zone"])) {
$args = array(
  'child_of' => $_POST["zone"],
  'hide_empty' => 0
  ); }
  else {
  $args = array(
  'child_of' => 59,
  'hide_empty' => 0
  ); 
  }

$categories=get_categories($args);
?>
<div style="float: left; min-width: 25%">
	<label>Paese</label>
	<select name="country" >
	<option value="<?php if(isset($_POST["zone"])){echo $_POST["zone"];} else echo"59"; ?>">Tutti</option>
	<?php 
	foreach($categories as $category) { 
	if($category->parent != 59 ){ ?>


	<option value="<?php echo $category->term_id; ?>" <?php if($_POST['country'] == $category->term_id){ ?> selected <?php } ?>>
	<?php echo $category->name; ?></option>
	<?php
	}
	} 
	?></select> 
</div>

<?php  ?>
<?php
$args = array(
  'child_of' => 65,
  'hide_empty' => 0
  );

$categories=get_categories($args);
?>

<div style="float: left; min-width: 25%">
	<label>Settore</label>
	<select name="industry" onchange="this.form.submit()">
	<option value="65">Tutti</option>
	<?php
	foreach($categories as $category) { 
	if($category->parent == 65 ){ ?>

	<option value="<?php echo $category->term_id; ?>"  <?php if($_POST['industry'] == $category->term_id){ ?> selected <?php } ?> > <?php echo $category->name; ?></option>
	<?php
	} 
	} 
	?></select>
</div>

<?php if(isset($_POST["industry"])) {
$args = array(
  'child_of' => $_POST["industry"],
  'hide_empty' => 0
  );
  }
else {
$args = array(
'child_of' => 65,
  'hide_empty' => 0
  );
}
$categories=get_categories($args);


?>
<div style="float: left; min-width: 25%">
	<label>Prodotto</label>
	<select name="work" >
	<option value="<?php if(isset($_POST["zone"])){ echo $_POST["industry"];} else echo "65"; ?>">Tutti</option>
	<?php 
	foreach($categories as $category) { 
	if($category->parent != 65 ){ 
	 ?>

	<option value="<?php echo $category->term_id; ?>" <?php if($_POST['work'] == $category->term_id){ ?> selected <?php } ?>><?php echo $category->name; ?></option>
	<?php
	}
	} 
	?></select> 
</div>

<?php  ?>
<div class="row-fluid">
<p style="float: left; min-width:50%"><input type="submit" name="search" value="Cerca" ></p>
</form>
  <form action="" method="post">
  <p style="float: left; min-width:50%"><input type="submit" name="reset" value="Reset"></p>
  </form>
</div>
<hr />
<?php
if(isset($_SESSION['country'])){
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
   $category_posts = new WP_Query(array( 'category__and' => array( $_SESSION['country'], $_SESSION['work'] ),'posts_per_page' => '20','paged' => $paged ));
?>
<div class="custom-search-content">
<?php
   if($category_posts->have_posts()) : 
      while($category_posts->have_posts()) : 
         $category_posts->the_post();
?>
<!--
         <h1><a href="<?php the_permalink(); ?>" ><?php the_title() ?></a></h1>
          <div class="custom-search-excerpt">
		  <?php the_excerpt() ?>
		  </div>
-->
<article class="blog-post <?php echo get_post_class() ?>" id="post-<?php the_ID(); ?> ">
	<?php $src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'full');?>
	<?php if (has_post_thumbnail()) { ?>
    <a href="<?php echo $src[0] ?>" rel="prettyPhoto" title="<?php echo $post->post_title ?>"><?php the_post_thumbnail('single'); ?></a>
	<?php } ?>
	<div class="row-fluid">
		<div class="span3"><?php include(TEMPLATEPATH . '/inc/blog-info.php'); ?></div>
		<div class="span9">
			<h2 class="post-title"><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
			<?php the_excerpt(); ?><span class="read_more"><a href="<?php the_permalink(); ?>">[ Leggi Tutto &rarr; ]</a></span>
		</div>
	</div>
</article>
<hr />
<?php
      endwhile; ?>
	  </div>
	   <nav class="custom-search-nav">
		<div style="float: left; font-size: 16px;"><?php previous_posts_link( '&laquo; PRECEDENTE', $category_posts->min_num_pages) ?></div>
		<div style="float: right; font-size: 16px;"><?php next_posts_link( 'SUCCESSIVO &raquo;', $category_posts->max_num_pages) ?></div>
	   </nav>
	  <?php
   else: 
?>

      Nessun post appartiene all'insieme di categorie selezionate.

<?php
   endif;
   }
?>
</div>
</div>
</section>
<?php get_footer(); ?>
 

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