function validate_email(email) {
	var pattern = /^[a-zA-Z0-9][a-zA-Z0-9._-]*\@[a-zA-Z0-9][a-zA-Z0-9._-]*\.[a-zA-Z0-9]{2,4}$/;
	if (pattern.exec(email.value) != null)
		return true;
	alert("Please enter a valid Email address.");
	return false;
}

function is_valid_email(email) {
	var pattern = /^[a-zA-Z0-9][a-zA-Z0-9._-]*\@[a-zA-Z0-9][a-zA-Z0-9._-]*\.[a-zA-Z0-9]{2,4}$/
	if (pattern.exec(email) != null) {
		return true
	}
	return false
}