add to functions.php

meta-boxes-for-wordpress.php

<?php 

//add excerpt field to pages as well, and not only posts:
function my_page_excerpt_meta_box() {
	add_meta_box( 'postexcerpt', __('Excerpt'), 'post_excerpt_meta_box', 'page', 'normal', 'core' );
}
add_action( 'admin_menu', 'my_page_excerpt_meta_box' );

//add Facts box to all pages
function my_facts_meta_box() {
	add_meta_box( 'facts', __('Vidste du at'), 'facts_meta_box', 'page', 'side', 'core' );
}
function facts_meta_box(){
	global $post;
	wp_nonce_field( 'facts', '_facts_nonce', false, true );
	$facts = get_post_meta( $post->ID, 'facts', true);
	$facts_textile = get_post_meta( $post->ID, 'facts_textile', true);
	if ($facts_textile=="" && $facts!="") $facts_textile=$facts;
?>
	<p>
		Tekst (formatteres med <a href="#" onclick="jQuery('#textile-help').slideToggle(); return false;" title="Vis kort hjælp om hvordan textile virker...">Textile</a>)<br>
		<textarea name="facts_textile" id="facts_textile" rows="6" cols="20" style="width:99%"><?php echo attribute_escape( $facts_textile ); ?></textarea>
	</p>
	<div id="textile-help" style="display:none;">
		<p style="margin-top:0">
		bulletlister skrives på folgende måde:<br><br>
		* text<br />
		* text <small style="color:#999">etc.</small><br />
		<br />
		dobbelt linieskifte for at afslutte liste<br /><br />
		<code>fed *tekst*</code> &rarr; fed <strong>tekst</strong><br />
		<code>kursiv _tekst_</code> &rarr; kursiv <em>tekst</em><br />
		</p>
		<p><a href="http://textile.thresholdstate.com/" target="_blank">Læs mere om textile</a></p>
		<p>
		<small style="color:#999;font-size:10px">Debug - her vises teksten konverteret til HTML</small>
		<textarea name="facts_contents" disabled="disabled" id="facts_contents" rows="3" cols="20" style="width:99%;font-size:11px; color:#ccc"><?php echo attribute_escape( $facts ); ?></textarea>
		</p>
	</div>
<?php
}
function facts_save_meta_box( $post_ID ) {
	if ( wp_verify_nonce( $_REQUEST['_facts_nonce'], 'facts' ) ) {
		//$facts = $_POST['facts_contents'];
		$facts_textile = $_POST['facts_textile'];
		$textile = new Textile;	
		$facts = $textile->TextileThis($facts_textile);
		
		if ( isset( $_POST['facts_textile'] ) && strlen( $_POST['facts_textile'] ) > 0 ) {
			update_post_meta( $post_ID, 'facts', $facts );
			update_post_meta( $post_ID, 'facts_textile', $facts_textile );
		} else {
			delete_post_meta( $post_ID, 'facts' );
			delete_post_meta( $post_ID, 'facts_textile' );
		}
	}
	return $post_ID;
}

add_action( 'admin_menu', 'my_facts_meta_box' );
add_action("save_post", 'facts_save_meta_box', 10, 2);
add_action("preview_post", 'facts_save_meta_box', 10, 2);

?>