Enqueueing scripts from within a plugin file

plugin.php

<?php
/**                                                                        
 * Plugin Name: Plugin name
 */
                                                                           
add_action( 'wp_enqueue_scripts', 'enqueue_scripts__pluginname' );

function enqueue_scripts__pluginname() {
        $jquery_location = WP_PLUGIN_URL . "/panomanager/js/jquery.js";    
        wp_register_script('jquery', $jquery_location, true);
        wp_enqueue_script('jquery');                                       
}