addLoadListener(initValidation);

function initValidation() {
	var subscribe = document.getElementById("subscribe");
	var unsubscribe = document.getElementById("unsubscribe");
	if (subscribe) {
		subscribe.onclick = validateSubscribeForm;
	}
	if (unsubscribe) {
		unsubscribe.onclick = validateUnsubscribeForm;
	}
	return true;
}

function validateSubscribeForm() {
	var emailFieldSubscribe = document.getElementById("subscribe-email");
	var nameFieldSubscribe = document.getElementById("subscribe-name");
	if (nameFieldSubscribe.value == '' || nameFieldSubscribe.value == 'First Name') {
		alert("Please enter your First Name");
		return false;
	}
	if (!/^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$/.test(emailFieldSubscribe.value)) {
		alert("The e-mail address you have entered is not a valid e-mail address");
		return false;
	}
}

function validateUnsubscribeForm() {
	var emailFieldUnsubscribe = document.getElementById("unsubscribe-email");
	if (!/^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$/.test(emailFieldUnsubscribe.value)) {
		alert("The e-mail address you have entered is not a valid e-mail address");
		return false;
	}
}

function addLoadListener(fn) {
	if (typeof window.addEventListener != 'undefined') {
		window.addEventListener('load', fn, false);
	} else if (typeof document.addEventListener != 'undefined') {
		document.addEventListener('load', fn, false);
	} else if (typeof window.attachEvent != 'undefined') {
		window.attachEvent('onload', fn);
	} else {
		var oldfn = window.onload;
		if (typeof window.onload != 'function') {
			window.onload = fn;
		} else {
			window.onload = function() {
				oldfn();
				fn();
			};
		}
	}
}