function subscribe_newsletter()
{
	if($('newsletter_subscribe'))
	{
		var errorMsg	= '';
		var error		= false;
		if($('newsletter_subscribe').name.value == '')
		{
			errorMsg	+= error_name;
			error		= true;
			$('newsletter_subscribe').name.focus();
		}
		if(checkEmail($('newsletter_subscribe').email.value) === false)
		{
			errorMsg	+= error_email;
			error		= true;
			$('newsletter_subscribe').email.focus();
		}

		if(error === true)
		{
			alert(errorMsg);
			return false;
		}
		else if(error === false)
		{
			return true;
		}
	}
	return false;
}
function unsubscribe_newsletter()
{
	if($('newsletter_unsubscribe'))
	{
		var errorMsg	= '';
		var error		= false;
		if(checkEmail($('newsletter_unsubscribe').email.value) === false)
		{
			errorMsg	+= error_email;
			error		= true;
			$('newsletter_unsubscribe').email.focus();
		}

		if(error === true)
		{
			alert(errorMsg);
			return false;
		}
		else if(error === false)
		{
			return true;
		}
	}
	return false;
}
function checkEmail(email)
{
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,6})+$/.test(email))
	{
		return true;
	}
	return false;
}