Wordpress Custom Plug (how to call multiple javascript files)

<?php

/*
Plugin Name: Tab Header Code
Plugin URI: [insert the plugin uri here]
Description: Inserts appropriate javascript and css libraries for tabs
Author: Jesse Wallace
Version: 0.1
Author URI: http://www.enticent.com
Generated At: www.wp-fun.co.uk;
*/

if (!class_exists('tabstyles')) {
    class tabstyles {

	/**
	* PHP 4 Compatible Constructor
	*/

	function tabstyles(){$this->__construct();}

	/**
	* PHP 5 Constructor
	*/

	function __construct(){
	add_action("init", array(&$this,"add_script1"));
	add_action("init", array(&$this,"add_script2"));
	add_action("init", array(&$this,"add_script3"));
	add_action("wp_head", array(&$this,"add_css"));
	}

	/**
	* Tells WordPress to load the scripts
	*/

	function add_script1(){
	wp_enqueue_script('tab_header_code_script1', '/wp-content/plugins/tab-header-code/js/tabview-min.js', NULL , 0.1);
	}

	function add_script2(){
	wp_enqueue_script('tab_header_code_script2', '/wp-content/plugins/tab-header-code/js/element-min.js', NULL , 0.1);
	}

	function add_script3(){
	wp_enqueue_script('tab_header_code_script3', '/wp-content/plugins/tab-header-code/js/yahoo-dom-event.js', NULL , 0.1);
	}

	/**
	* Adds a link to the stylesheet to the header
	*/

	function add_css(){
	echo '<link rel="stylesheet" href="'.get_bloginfo('wpurl').'/wp-content/plugins/tab-header-code/css/tabstyle.css" type="text/css" media="screen"  />';
	}
}
}

//instantiate the class
if (class_exists('tabstyles')) {
    $tabstyles = new tabstyles();
}

?>

add_action('admin_menu', 'add_pages');

function add_pages() {
    $my_plugin_page = add_menu_page('Plugin Name', 'Plugin Name',  8,__FILE__, 'invoice_overview',"images/plugin_icon.png");

    // This is the trick, notice the "$my_plugin_page" being tacked on the end of admin_print_scripts
    add_action( "admin_print_scripts-$my_plugin_page", 'admin_head');

}

function admin_head() {
    global $path_to_your_files;

    // You may notice array('jquery') at the end, that means jQuery is required to make that particular file function, and WP will include it automatically
    wp_enqueue_script('jquery.whatever',$path_to_your_files . "/js/jquery.whatever.js", array('jquery'));
    wp_enqueue_script('jquery.autocomplete',$path_to_your_files . "/js/jquery.autocomplete.js", array('jquery'));
    wp_enqueue_script('your_custom_file',$path_to_your_files . "/js/your_custom_file.js", array('jquery'));

}

add_action('wp_head', 'insert_head');

function insert_head() {
    ?>
    <script type="text/javascript" src="<?php bloginfo('wpurl') ?>/wp-content/plugins/tab-header-code/js/tabview-min.js"></script>
    <script type="text/javascript" src="<?php bloginfo('wpurl') ?>/wp-content/plugins/tab-header-code/js/element-min.js"></script>
    <script type="text/javascript" src="<?php bloginfo('wpurl') ?>/wp-content/plugins/tab-header-code/js/yahoo-dom-event.js"></script>
    <link type="text/css" src="<?php bloginfo('wpurl') ?>/wp-content/plugins/tab-header-code/css/tabstyle.csss"></link>
    <?php
}

<?php

if (!class_exists('tabstyles')) {
    class tabstyles {

        /**
        * PHP 4 Compatible Constructor
        */

        function tabstyles(){$this->__construct();}

        /**
        * PHP 5 Constructor
        */

        function __construct(){
            add_action("init", array(&$this,"on_init"));
        }

        /**
        * Tells WordPress to load the scripts
        */

        function on_init(){
			// scripts
            wp_enqueue_script('tab-view-min', get_bloginfo('wpurl').'/wp-content/plugins/tab-header-code/js/tabview-min.js');
            wp_enqueue_script('element-min', get_bloginfo('wpurl').'/wp-content/plugins/tab-header-code/js/element-min.js');
            wp_enqueue_script('yahoo-dom-event', get_bloginfo('wpurl').'/wp-content/plugins/tab-header-code/js/yahoo-dom-event.js');

			//css
            wp_enqueue_style('tabstyle', get_bloginfo('wpurl').'/wp-content/plugins/tab-header-code/css/tabstyle.css');

        }

    }
}

//instantiate the class
if (class_exists('tabstyles')) {
    $tabstyles = new tabstyles();
}