It’s a little more complicated to assign a different single post template for a particular category. In single.php, paste this code:

<?php
 $post = $wp_query->post;
 if (in_category('mynewcategory')) {
 include(TEMPLATEPATH.'/single-mynewcategory.php');
 } else{
 include(TEMPLATEPATH.'/single-default.php');
 }
?>

single-mynewcategory.php is of course the category for which you would like a different single post template, whereas single-default.php is where you would put the normal single.php code.

If you would like to assign numerous single post templates, use this code:

<?php
$post = $wp_query->post;
if(in_category('mynewcategory')) {
include(TEMPLATEPATH.'/single-mynewcategory.php');
} elseif (in_category('mynewcategory2')) {
include(TEMPLATEPATH.'/single-mynewcategory2.php');
} elseif (in_category('portfolio')) {
include(TEMPLATEPATH.'/single-portfolio.php');
} else {
include(TEMPLATEPATH.'/single-default.php');
}
?>

In loop.php, change this line:

<?php if ( is_archive() || is_search() ) : // Only display excerpts for archives and search. ?>

to this:

That’s it. Will work like a charm.

<?php if ( is_archive() || is_search() || is_home() || is_front_page() ) : // Only display excerpts for archives and search. ?>

Instead, use the wp_enqueue_script, the WordPress-friendly method. You will need direct access to your WordPress files.

1. Go into wp-content/plugins, and create a new javascript folder.
2. In this folder, place your .js file.
3. In header.php, before <?php wp_head(); ?>, place this:

<?php
wp_enqueue_script('custom',
'/' . PLUGINDIR . '/javascript/yourscript.js',
array('jquery'),
'1.0' );
?>

That’s it. You don’t need to do anything additional to include the jQuery library, since it’s specified as in the array as a file that your script is dependent upon. In place of ‘jquery’ you can use Scriptaculous, jQuery UI Tabs, or any number of libraries that are built into WordPress.

Those libraries, as well as additional information about the wp_enqueue_script can be found at codex.wordpress.org/Function_Reference/wp_enqueue_script.

According to the codex, this script can’t be placed above <?php wp_head(); ?>, but I’ve found that on the contrary, it works ONLY when placed above it. This same page of the codex also says that ‘$’ can be used instead of ‘jQuery’ inside the document ready function, which is also currently not accurate.

In other words, where you would use ‘$’ in your jQuery function, you MUST use ‘jQuery’ for every instance, not just in the document ready function. Feel free to test this with your own script; I’m not sure why the Codex is wrong on these points.