function checkMail(strEmail,strError)
{
	var error = "";
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(strEmail) != true) {
		error = strError;
	}
	return error;
}