// php code withing the same page

<?php
if (!$_REQUEST['submit']) { 
		$results = ""; 
} else {
	
	switch ($_REQUEST['storage']) {
		case 500:
			$price = 1.00;
			$space = '500 MB';
		break;
		case 1:
			$price = 2.00;
			$space = '1 GIG';
		break;
		case 2:
			$price = 3.00;
			$space = '2 GIG';
		break;
		case 3:
			$price = 4.00;
			$space = '3 GIG';
		break;
		case 4:
			$price = 5.00;
			$space = '4 GIG';
		break;
		case 5:
			$price = 6.00;
			$space = '5 GIG';
		break;
		case 10:
			$price = 10.00;
			$space = '10 GIG';
		break;
		case 20:
			$price = 15.00;
			$space = '20 GIG';
		break;
		case 50:
			$price = 20.00;
			$space = '50 GIG';
		break;
	}
}
?>

// form that calls the php code

<form action="<?php echo $PHP_SELF; ?>" method="post">
		<select name="storage">
		<option value="500" selected="selected">500 MB</option>
		<option value="1">1 GIG</option>
		<option value="2">2 GIG</option>
		<option value="3">3 GIG</option>
		<option value="4">4 GIG</option>
		<option value="5">5 GIG</option>
		<option value="10">10 GIG</option>
		<option value="20">20 GIG</option>
		<option value="50">50 GIG</option>
		</select>		
</form>

// should echo the results based on the variables set by the form

	<?php 
	echo "<b>Storage:</b> {$_REQUEST['space']} <b>Total Price:</b> {$_REQUEST['price']}";
	?>

// returns in bold

Storage: Total Price: