Создание плагина вывода случайного товара VirtueMart 2.0 - [VM2&3] Общие вопросы и ошибки

public function onContentAfterDisplay($context, &$article, &$params, $limitstart)
	{

function showJustBuy(time) {
						setTimeout(function() {
							$j('#justBuy').animate({
								'right': '+=250px'
							}, 1000);
						}, time);
					}

<?php

// no direct access
defined('_JEXEC') or die;

class vmRandomItem extends JPlugin
{
	public function onContentAfterDisplay($context, &$article, &$params, $limitstart)
	{
		$document = & JFactory::getDocument();
		$document->addStyleSheet(JURI::base(). "plugins/content/vmrandomitem/vmrandomitem.css");
		$document->addScript(JURI::base(). "plugins/content/vmrandomitem/vmrandomitem.js");
		
		$page_num = set_page_num();
		$rand_num_start = set_rand_num_start();
		$rand_num_end = set_rand_num_end();
		$start_to_show = set_start_to_show();
		$show_time = set_show_time();
		$animation_speed = set_animation_speed();
		
		function set_page_num() {
			if($this->params->get('page-nums'))
				return str_to_arr($this->params->get('page-nums'));
			else
				return [1];
		}
		
		function set_rand_num_start() {
			if($this->params->get('rand-num-start'))
				return str_to_int($this->params->get('rand-num-start'));
		}
		
		function set_rand_num_end() {
			if($this->params->get('rand-num-end'))
				return str_to_int($this->params->get('rand-num-end'));
		}
		
		function set_start_to_show() {
			if($this->params->get('start-to-show'))
				return str_to_int($this->params->get('start-to-show'));
			else
				return 0;
		}
		
		function set_show_time() {
			if($this->params->get('show-time'))
				return str_to_int($this->params->get('show-time'));
			else
				return -1;
		}
		
		function set_animation_speed() {
			if($this->params->get('animation-speed'))
				return str_to_int($this->params->get('animation-speed'));
			else
				return 1;
		}
		
		function str_to_arr($str) {
			return array_map('intval', explode(",", $str);
		}
		function str_to_int($str) {
			return intval($str);
		}
		
		
		if (isset($_SESSION['counter']) && isset($_SESSION['show_num'])) {
			$_SESSION['counter']++;
			if($_SESSION['counter'] == $_SESSION['show_num']) { ?>
				<script type="text/javascript">
					function showJustBuy(time) {
						setTimeout(function() {
							$j('#justBuy').animate({
								'right': '+=250px'
							}, 1000);
						}, time);
					}
					function hideJustBuy(time) {
						$j('#justBuy').animate({
							'right': '-=250px'
						}, time);
					}
					function waitingSomeSeconds(time, hideTime) {
						setTimeout(function() {
							hideJustBuy(hideTime);
						}, time);
					}
				</script>
			<?php }
		} else {
			$_SESSION['counter']=0;
			if($this->params->get('rand-num-start') && $this->params->get('rand-num-end')) array_push($page_num, rand($rand_num_start, $rand_num_end));
			if($this->params->get('page-nums')) $_SESSION['show_num'] = $page_num;
		}
		
	}
}

?>