function check_contact_form() {
	if (document.getElementById('name').value == '') {
		alert('Please enter your full name.');
		return false;
	}
	if (document.getElementById('email').value == '') {
		alert('Please enter your email address.');
		return false;
	}
	if (!(isEmail(document.getElementById('email').value))) {
		alert('Please enter a valid email address.');
		return false;
	}
	if (document.getElementById('comments').value == '') {
		alert('Please enter your comments.');
		return false;
	}
	return true;
}

function check_booking_form() {
	if (document.contact.name.value == '') {
		alert('Please enter your full name.');
		return false;
	}
	if (document.contact.telephone.value == '') {
		alert('Please enter your telephone number.');
		return false;
	}
	if (document.contact.email.value == '') {
		alert('Please enter your email address.');
		return false;
	}
	if (!(isEmail(document.contact.email.value))) {
		alert('Please enter a valid email address.');
		return false;
	}
	if (document.contact.address.value == '') {
		alert('Please enter your address.');
		return false;
	}
	if (document.contact.comments.value == '') {
		alert('Please enter your comments.');
		return false;
	}
	return true;
}

function isEmail(email) {
	var re = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/
	return re.test(email);
}

function switch_image_home(pic) {
	document.getElementById('fader').innerHTML = '<img id="pic" src="" alt="" />';
	document.getElementById('pic').src = pic.src;
}

function switch_image_media(pic) {
	document.getElementById('pic').src = pic;
	document.getElementById('download').href = pic.replace('_med', '');
}

function switch_image(pic) {
	document.getElementById('pic').src = pic.src;
}