function checkMailSub()
{
	var x = document.listform;

	if (!validEmail(x.address.value))
	{
		alert("You must enter your email address");
		x.address.focus();
	}
	else if (!validEmail(x.address.value))
	{
		alert("You must enter a valid email address!");
		x.address.focus();
	}
	else
	{
		window.open("maillist.php@userID=_3C@=urlencode($userID)@>&address=" + x.address.value + "&subscribe=" + (x.subscribe[0].checked ? 'subscribe' : 'unsubscribe'), 'adWin','width=325,height=' + (x.subscribe[0].checked ? "220" : "120") + ',status=0,toolbar=0,menubar=0,location=0,resizeable=1,scrollbars=1');
	}
}