function isValidEmail(str) {
		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
		return (reg.test(str))
	}

	function timedRefresh(timeoutPeriod) {
		setTimeout("location.reload(true);", timeoutPeriod);
	}