<!-- NEWSLETTER -->
function register(){
	$.ajax({
		type: "POST",
		url: "submit_data.php",
		data: 	"email=" + $("#newsletter_email").val(),
		success: function(html){
			$("#message").html(html);
			$("#newsletter_email").val('Votre adresse e-mail');
		}
	});
}
<!-- /NEWSLETTER -->

<!-- SLIDESHOW -->
function init_slideshow() {
	$("#slideshow").cycle();
}
<!-- /SLIDESHOW -->

<!-- INITIALIZE -->
init_slideshow();
<!-- /INITIALIZE -->