function getQuerystring(key, default_) {
	if (default_ == null) default_ = "";
	key = key.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
	var regex = new RegExp("[\\?&]" + key + "=([^&#]*)");
	var qs = regex.exec(window.location.href);
	if (qs == null)
		return default_;
	else
		return qs[1];
}

//\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
function mailFormatOK(email) {
	var filter = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
	return !filter.test(email);
}