Displaying meta box value

Below is a bit of code that I am working on modifying, borrowed from another part of the theme I am working with. From what I can tell, this meta box which, is for a URL to override the permalink added to new projects by default, functions and saves correctly. The bit that I am struggling with is getting the information from that meta box to display when called. So far <?php echo $project_url_options ?> is not working ??

What am I doing wrong?

$portfolio_options = array(	);

$project_url_options = array(
		"url" => array(
    	"type" => "input",
		"name" => $prefix."url",
    	"std" => "",
    	"title" => __('Web Project URL'),
    	"description" => __('Paste a URL to overide default Media Page.','bucapress'))
);

$meta_box_groups = array($page_options, $project_url_options);

function new_meta_box($post, $metabox) {	

	$meta_boxes_inputs = $metabox['args']['inputs'];

	foreach($meta_boxes_inputs as $meta_box) {

		$meta_box_value = get_post_meta($post->ID, $meta_box['name'].'_value', true);
		if($meta_box_value == "") $meta_box_value = $meta_box['std'];

		echo'<div class="meta-field">';

		echo'<input type="hidden" name="'.$meta_box['name'].'_noncename" id="'.$meta_box['name'].'_noncename" value="'.wp_create_nonce( plugin_basename(__FILE__) ).'" />';

		echo'<p><strong>'.$meta_box['title'].'</strong></p>';

		if(isset($meta_box['type']) && $meta_box['type'] == 'checkbox') {

			if($meta_box_value == 'true') {
				$checked = "checked=\"checked\"";
			} elseif($meta_box['std'] == "true") {
					$checked = "checked=\"checked\"";
			} else {
					$checked = "";
			}

			echo'<p class="clearfix"><input type="checkbox" class="meta-radio" name="'.$meta_box['name'].'_value" id="'.$meta_box['name'].'_value" value="true" '.$checked.' /> ';
			echo'<label for="'.$meta_box['name'].'_value">'.$meta_box['description'].'</label></p><br />';		

		} elseif(isset($meta_box['type']) && $meta_box['type'] == 'textarea')  {			

			echo'<textarea rows="4" style="width:98%" name="'.$meta_box['name'].'_value" id="'.$meta_box['name'].'_value">'.$meta_box_value.'</textarea><br />';
			echo'<p><label for="'.$meta_box['name'].'_value">'.$meta_box['description'].'</label></p><br />';			

		} else {

			echo'<input style="width:70%"type="text" name="'.$meta_box['name'].'_value" id="'.$meta_box['name'].'_value" value="'.$meta_box_value.'" /><br />';
			echo'<p><label for="'.$meta_box['name'].'_value">'.$meta_box['description'].'</label></p><br />';			

		}

		echo'</div>';

	} // end foreach

	echo'<br style="clear:both" />';

} // end meta boxes

function create_meta_box() {
	global $page_options, $portfolio_options, $project_url_options;	

	if ( function_exists('add_meta_box') ) {
		add_meta_box( 'new-meta-boxes-page-options', __('Page Options','bucapress'), 'new_meta_box', 'page', 'side', 'low', array('inputs'=>$page_options) );
		add_meta_box( 'new-meta-boxes-project-url', __('Project URL','bucapress'), 'new_meta_box', 'project', 'normal', 'high', array('inputs'=>$project_url_options) );
		add_meta_box( 'new-meta-boxes-project-url', __('Project UR','bucapress'), 'new_meta_box', 'page', 'normal', 'high', array('inputs'=>$project_url_options) );
	}
}

function save_postdata( $post_id ) {
global $post, $new_meta_boxes, $meta_box_groups;

if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) {
	return $post_id;
}

if( defined('DOING_AJAX') && DOING_AJAX ) { //Prevents the metaboxes from being overwritten while quick editing.
	return $post_id;
}

if( ereg('/\edit\.php', $_SERVER['REQUEST_URI']) ) { //Detects if the save action is coming from a quick edit/batch edit.
	return $post_id;
}

foreach($meta_box_groups as $group) {
	foreach($group as $meta_box) {

		// Verify
		if(isset($_POST[$meta_box['name'].'_noncename'])){
			if ( !wp_verify_nonce( $_POST[$meta_box['name'].'_noncename'], plugin_basename(__FILE__) )) {
				return $post_id;
			}
		}

		if ( isset($_POST['post_type']) && 'page' == $_POST['post_type'] ) {
			if ( !current_user_can( 'edit_page', $post_id ))
				return $post_id;
		} else {
			if ( !current_user_can( 'edit_post', $post_id ))
				return $post_id;
		}

		$data = "";
		if(isset($_POST[$meta_box['name'].'_value'])){
			$data = $_POST[$meta_box['name'].'_value'];
		}

		if(get_post_meta($post_id, $meta_box['name'].'_value') == "")
			add_post_meta($post_id, $meta_box['name'].'_value', $data, true);
		elseif($data != get_post_meta($post_id, $meta_box['name'].'_value', true))
			update_post_meta($post_id, $meta_box['name'].'_value', $data);
		elseif($data == "" || $data == $meta_box['std'] )
			delete_post_meta($post_id, $meta_box['name'].'_value', get_post_meta($post_id, $meta_box['name'].'_value', true));

		} // end foreach
	} // end foreach
} // end save_postdata

add_action('admin_menu', 'create_meta_box');
add_action('save_post', 'save_postdata');