http://www.ramonfincken.com/permalink/topic216.html

I want to have my sidebar on my posts, but not my pages... but wordpress looks at pages and posts the same, so I thought I could give the sidebar a display:none css tag on the homepage and all other PAGEs as opposed to posts.
>>

Sure, its not that hard. Note: I haven't tested this code, a reference can be found over here: http://codex.wordpress.org/Function_Reference/get_post_meta

On the edit post/page below your textarea you can enter a custom value

enter: ( example, I presume you only use positive numbers in the code below, otherwhise remove  " || intval($mybodyid) == 0 "    )

mybodyid
with value: 15

Note: the "mybodyid" will show up in a dropdown after you have entered it once



Now edit your template, page.php or single.php (post)
To GET the actual value use this PHP code
<?php
	$mybodyid = get_post_meta($post->ID, 'mybodyid', true);
	// Default?
	if(!isset($mybodyid) || empty($mybodyid) || intval($mybodyid) == 0)
	{
		$mybodyid = 'defaultid'; // Or use a number here
	}
?>

Right now we have or bodyid, OR a default value.

The only thing you have to do right now is to "show" this somewhere like this:

<div id="myid_<?php echo $mybodyid; ?>">
Yadayada
</div>

this will show:
<div id="myid_15">
	Yadayada
</div>

OR in the default case
<div id="myid_defaultid">
	Yadayada
</div>