gistfile1.html

<form method="post" class="formulario-early-suscriber" id="form-plan-anual">
    <input name="email" placeholder="Escribe tu Email" type="email" required>
    <input name="plan" value="anual" type="hidden">
    <input name="precio" value="195 eur" type="hidden">
    <button class="submit-form" data-em="button" type="submit">Avísame Cuando esté Listo</button>
</form>

<!-- Javascript Code -->
<script type="text/javascript">
$(document).ready(function() {
$('.formulario-early-suscriber').on('submit',enviar_email);

function enviar_email(ev){
	ev.preventDefault();
	var url = "early_suscribe.php";
	var form = this;
	$.ajax({
		type: "POST",
		url: url,
		data: $(form).serialize(), // Adjuntar los campos del formulario enviado.
		success: function(data){
			parent = $(form).parent();
			parent.find('.close-link').remove();
			$(form).hide();
			parent.append('<p class="alert alert-success early-suscribe-success">'+data+'</p>');
		}
	});
}

});
</script>