$(document).ready(function(){
	new Image().src = '/images/bg-menu-button.png';
	new Image().src = '/images/bg-steps.png';
	if (document.getElementById('newsletter')) {
		var newsletter_form = document.getElementById('newsletter');
		newsletter_form.onsubmit = function(){
			document.getElementById('newsletter_submit').disabled = true;
			subscribeEmail(this);
			return false;
		};
	}
});

function subscribeEmail(form) {
	var email = form.subscribe.value;
	sendRequest('/newsletter.php?subscribe=' + email, subscribeResponse);
}

function subscribeResponse(req) {
	alert(req.responseText);
	document.getElementById('newsletter_submit').disabled = false;
}