custom function with nested conditionals

I use the Thesis Theme, but I’ll try to make this as generic as possible.

Basically I want to run html_code_1 if it’s a category page. That’s easy.

function custom_category_mmbox() {
if (is_category()){
?>
<html_code_1>
<?php }

/*But if it’s my home page, I want to check the MOST RECENT POST for a custom field, grab a value IF it’s there and run it. Otherwise, just run html_code_1. I’m a Python person. No matter what I do, I get bracket errors with this. Thanks for any help.*/

elseif(is_home()) {

/*This allegedly gets me the post_id of the most recent post. */

query_posts(‘showposts=1’);
while (have_posts()) : the_post();
$post_id = $post->ID;

/* Now see if it has a $key called “thesis_custom_code”

$key=”thesis_custom_code”;
$mm_code = get_post_meta($post->ID, $key, true);

/* If it has such a key, echo the code */

{ if($mm_code):
echo $mm_code;
}

/* If no custom field named thesis_custom_code, just run the first chunk of html_code_1 */

else:
?>
<html_code_1>
<?php }
/* Thesis functions to hook the code in */
add_action(‘thesis_hook_multimedia_box’, ‘custom_category_mmbox’);