function validate_signup(frm) {
	var emailAddress = frm.Email.value;
	var errorString = '';
	if (emailAddress == '' || emailAddress.indexOf('@') == -1) {
		errorString = 'Please enter your email address';
	}

	var isError = false;
    if (errorString.length > 0)
        isError = true;

    if (isError)
        alert(errorString);
	return !isError;
}