// file template_MyForm.php
<?php
/*
Template Name: MyForm
*/
?>

<?php get_header(); ?>


<div class="itm_contenidor">
<form id="itm_form" >
Nombre: <input type="text" name="itm_name" placeholder="Nombre" >
Email: <input type="text" name="itm_email" placeholder="Tu email" >
<input type="submit" value="Enviar">
<input type="hidden" name="itm_oculto" value="0">

</form>
</div>
<div id="destino"></div>

<?php get_footer(); ?>

<?php

/*
Plugin Name: ITM SIMPLE PAYPAL
Plugin URI: http://aprendesap.com
Description: A simple plugin that calls paypal
Author: Ignasi Tort
Author URI: http://aprendesap.com
Version: 1.0
License: GNU
*/


    function itm_scripts_load_cdn()
    {
        // Deregister the included library
        wp_deregister_script( 'jquery' );  // Comment this line if you not use Google's CDN

        // Register the library again from Google's CDN  // Comment this line if you not use Google's CDN
        wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js', array(), null, false );

        // Register the script like this for a plugin:
        wp_register_script( 'itm_simple_paypal', plugins_url( '/itm_simple_paypal.js', __FILE__ ), array( 'jquery' ) );

        // For either a plugin or a theme, you can then enqueue the script:
        wp_enqueue_script( 'itm_simple_paypal');
    }
    add_action( 'wp_enqueue_scripts', 'itm_scripts_load_cdn' );



    function itm_simple_paypal_styles()
    {
        // Register the style like this for a plugin:
        wp_register_style( 'itm-paypal-style', plugins_url( '/itm_simple_paypal.css', __FILE__ ), array(), '20130131', 'all' );

        // For either a plugin or a theme, you can then enqueue the style:
        wp_enqueue_style( 'itm-paypal-style' );
    }
    add_action( 'wp_enqueue_scripts', 'itm_simple_paypal_styles' );



?>


// file itm_simple_paypal.js
jQuery(document).ready(function(){
   jQuery("#itm_form").submit(function(evento){
     evento.preventDefault();
     var form = jQuery(this);
     jQuery.post("itm_simple_paypal_process.php",jQuery(form).serialize(), function(data){

    // jQuery ('#destino').html(data);  // fills the div with data
    alert(data); // data appears on alert window
            });
       });

    // other events below

})


// file itm_simple_paypal.process.php

<?php

 include '../../../wp-load.php';
if( isset ($_POST['itm_email'])){
    if ( isset($_POST['itm_email'] ) && is_email($_POST['itm_email']) ) {
        $name = $_POST["itm_name"];
        $email = $_POST["itm_email"];
        echo '
        <h3>Formulario correcto</h3>
        <p>Gracias </p>
        '+$name+' '+$email+' ';
    }

} else {
echo '
        <h3>Formulario erróneo</h3>
        <p>Corrige los errores</p>
        '+$name+' '+$email+' ';


}


?>