function isEmailValid(sEmail) {
	if (sEmail.value == '' || sEmail.indexOf('.') == 0 || sEmail.indexOf('.') == -1 || sEmail.indexOf('@') == 0 || sEmail.indexOf('@') == -1 || sEmail.indexOf('.') == sEmail.length - 1 || sEmail.indexOf(',') >= 0) {
		return false;
	} else {
		return true;
	}
}