function showhide(id) {
	if (document.getElementById(id).style.display == "none" || document.getElementById(id).style.display=="") {
	  document.getElementById(id).style.display = "block";
	} else {
	  document.getElementById(id).style.display = "none";
	}
}

function emailValidator() {
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	errorMessage += 'You must supply an email address<br>';
	if(document.getElementById('email').value.match(emailExp)){
		return true;
	} else {
		document.getElementById('message').innerHTML = errorMessage;
		document.getElementById('email').focus();
		return false;
	}
}