function checkEmail (email){
    var email_strg=email.value;
//    var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2,3})?)$/i;
    var filter=/^[a-z][\w\._-]+@[a-z][\w\._-]+\.[a-z]{2,3}$/i;
    if (email_strg==''){
        alert('E-mail address empty');
        return false;
    }
    else if (filter.test(email_strg)==false ){
        alert('E-mail not valid');
        return false;
    }
    else {
        return true;
    }
}

function checkForm (formulaire){
    var filter=/[a-z]/i;
    if (filter.test(formulaire.name.value)==false){
        alert('Name not valid');
        return false;
    }
    else if (checkEmail(formulaire.email)==false){
        return false;
    }
    else {
        formulaire.submit();
    }
}