PHP and forms

Hello everyone,

I have created a form that allows visitors to my site choose how they want the posts to be displayed. They can order by title, date, modified, rand and by comment_count in either ascending or descending order.

When a visitor clicks a link the changes made previously revert back to their default state. How do I make the browser remember the selection?

I am using a switch / case statements at the moment… should I be using if’s?

Here is my code:

<?php
echo '<div id="refine">';
echo '<p>Sorted ';

switch ($_POST['selection']){

	case 'title':
		echo $_POST['title'] . ' <strong>alphabeticly</strong>';
		$orderby = "title";
		break;

	case 'date':
		echo $_POST['date'] . ' by <strong>date posted</strong>';
		$orderby = "date";
		break;

	case 'modified':
		echo $_POST['modified'] . ' by <strong>date modified</strong>';
		$orderby = "modified";
		break;

	case 'rand':
		echo $_POST['rand'] . ' <strong>randomly</strong>';
		$orderby = "rand";
		break;

	case 'comment_count':
		echo $_POST['comment_count'] . ' by <strong>popularity</strong>';
		$orderby = "comment_count";
		break;

	default:
		echo ' <strong>alphabeticly</strong>';
		break;
	}

echo ' in <strong>';

switch ($_POST['order']){

	case 'Acsending':
		echo $_POST['Acsending'] . 'ascending';
		break;

	case 'Decending':
		echo $_POST['Decending'] . 'descending';
		break;

	default:
		echo 'ascending';
		break;
	}

echo '</strong> order</p>';

if ($_SERVER["REQUEST_METHOD"] == "POST"){
	if ($_POST['order'] == "Acsending"){$order = "asc";}
	elseif ($_POST['order'] == "Decending"){$order = "desc";}
	}

?>

<form id="selection" action="" method="post">
	<select name="selection">
		<option name="title" value="title" <?php echo (isset($_GET['selection']) && $_GET['selection'] == 'title') ? ' selected="selected"' : '' ; ?>>Alphabetic</option>
		<option name="date" value="date" <?php if(!isset($_GET['submit']) && $_GET['submit'] == 'date') { echo 'selected="selected"' ;} ?>>Posted</option>
		<option name="modified" value="modified" <?php echo (isset($_GET['selection']) && $_GET['selection'] == 'modified') ? ' selected="selected"' : '' ; ?>>Modified</option>
		<option name="rand" value="rand" <?php echo (isset($_GET['selection']) && $_GET['selection'] == 'rand') ? ' selected="selected"' : '' ; ?>>Random</option>
		<option name="comment_count" value="comment_count" <?php echo (isset($_GET['selection']) && $_GET['selection'] == 'comment_count') ? ' selected="selected"' : '' ; ?>>Popularity</option>
		</select>
	<input type="submit" name="order" value="Acsending">
	<input type="submit" name="order" value="Decending">
	</form>

<?php

echo '</div><!--end refine-->';

$orderby = 'title';
$order = 'asc';

$cats = array(2, 3, 4, 5, 6 ,7, 8, 9, 10);
foreach ($cats as $c){
	$posts = query_posts($query_string . '&orderby=' . $orderby . '&order=' . $order . '&cat=' . $c);

if($posts) :
	while (have_posts()) :
		the_post();
?>

[html content]

Thanks for looking,
Sam