Помогите подключить скрипт, как плагин.

Написал плагин… Уж как вышло. 🙂
Вот файл подключения к WP, всё работает, но гляньте, что я безграмотно сделал?

<?php
/*
Plugin Name: Sites coloring
Plugin URI: https://runza.ru/index.php?topic=2.0
Description: Color any WP site, you don't need to know CSS. Very simple: click with the left mouse button - paint, right click - cancel.
Version: 1.0
Author: Alexander Zhernovkov
Author URI: http://runza.ru
License: GPL2
*/

if(!defined('WP_CONTENT_URL'))
	define('WP_CONTENT_URL', get_option('siteurl') . '/wp-content');
if(!defined('WP_CONTENT_DIR'))
	define('WP_CONTENT_DIR', ABSPATH . 'wp-content');
if(!defined('WP_PLUGIN_URL'))
	define('WP_PLUGIN_URL', WP_CONTENT_URL. '/plugins');
if(!defined('WP_PLUGIN_DIR'))
	define('WP_PLUGIN_DIR', WP_CONTENT_DIR . '/plugins');

	
class STbox {

    function cssStyles() {
      $stPath = WP_PLUGIN_URL.'/'.plugin_basename(dirname(__FILE__)).'/css'.'/';
      echo '<link rel="stylesheet" type="text/css" media="screen" href="' . $stPath . 'coloring.css" />'."\n";
    }

    function headerCssbox() {
	$bodyDiv = '
	<style type="text/css">body {opacity: 0;}</style>
	<div class="comm">
	<div id="modal_form">
	CSS reset?<br><br>
		<button class="CSSok">OK</button>
		<button class="no">NO</button>
	</div>
	<div id="overlay"></div>
	<div id="modal_formm">
	All reset?<br><br>
		<button class="Allok">OK</button>
		<button class="no">NO</button>
	</div>
	<div id="overlayy"></div>
	<div class="in">
		<div class="probs">
			<button class="butt">Sample:</button>
          	<input class="prob" value="Body" readonly="readonly">
          	<input class="prob" value="Link" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
          	<input class="prob" value="Sample" readonly="readonly">
		</div>
		<div class="bgrs">
			<button class="butt">Background:</button>
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">
          	<input class="jscolor {hash:true,position:\'left\'} bgr">

		</div>
		<div class="cols">
			<button class="butt">Color:</button>
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
          	<input class="jscolor {hash:true,position:\'left\'} col">
		</div>
	</div>
	<div class="knop">
		<button class="but" id="Allreset">All reset</button>
		<button class="but" id="CSSreset">CSS reset</button>
		<button class="but" id="but">noLink</button>
	</div>
</div>
<div id="tooltip"></div>
<div id="cssbox">
';
	
		echo $bodyDiv;
	}
    function headerCssboxEnd() {
		$bodyDivEnd = '	</div> <!-- #cssbox -->'."\n";
		echo $bodyDivEnd;
	}
}

function RelatedPosts( $atts ) {
	extract(shortcode_atts(array(
	    'limit' => '5',
	), $atts));

	global $wpdb, $post, $table_prefix;

	if ($post->ID) {
		$retval = '<ul>';

		$tags = wp_get_post_tags($post->ID);
		$tagsarray = array();
		foreach ($tags as $tag) {
			$tagsarray[] = $tag->term_id;
		}
		$tagslist = implode(',', $tagsarray);

		$q = "SELECT p.*, count(tr.object_id) as count
			FROM $wpdb->term_taxonomy AS tt, $wpdb->term_relationships AS tr, $wpdb->posts AS p WHERE tt.taxonomy ='post_tag' AND tt.term_taxonomy_id = tr.term_taxonomy_id AND tr.object_id  = p.ID AND tt.term_id IN ($tagslist) AND p.ID != $post->ID
				AND p.post_status = 'publish'
				AND p.post_date_gmt < NOW()
 			GROUP BY tr.object_id
			ORDER BY count DESC, p.post_date_gmt DESC
			LIMIT $limit;";

		$related = $wpdb->get_results($q);
 		if ( $related ) {
			foreach($related as $r) {
				$retval .= '<li><a title="'.wptexturize($r->post_title).'" href="'.get_permalink($r->ID).'">'.wptexturize($r->post_title).'</a></li>';
			}
		} else {
			$retval .= '
	<li>Нет связанных материалов.</li>';
		}
		$retval .= '</ul>';
		return $retval;
	}
	return;
}

function jScript() {
	wp_enqueue_script( 'jquery');
	wp_enqueue_script( 'jscolor', WP_PLUGIN_URL.'/'.plugin_basename(dirname(__FILE__)) . '/js/jscolor.js', true );
	wp_enqueue_script( 'js_style', WP_PLUGIN_URL.'/'.plugin_basename(dirname(__FILE__)) . '/js/js_style.js', array('jquery'), '', true );
}
	add_action( 'wp_enqueue_scripts', 'jScript' );

if (class_exists("STbox")) {
	$dl_plugin = new STbox();
}

if (isset($dl_plugin)) {

	add_action('wp_head', array(&$dl_plugin, 'cssStyles'));
	add_action('wp_body_open', array(&$dl_plugin, 'headerCssbox'));
	add_action('wp_footer', array(&$dl_plugin, 'headerCssboxEnd'));

}

add_shortcode('link', 'URL');
add_shortcode('DownloadButton', 'DownloadButton');
add_shortcode('RelatedPosts', 'RelatedPosts');

?>