function checkemail(email, errorText){
    var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
    if (filter.test(email)) {
        return true;
    } else{
        if (errorText != '') alert(errorText);
        return false;
    }
}