var flag1 = new Boolean(true);
var flag2 = new Boolean(true);
var flag3 = new Boolean(true);
var nav = (navigator.appName).toLowerCase();
if (nav.indexOf("microsoft internet explorer") !=-1){
    var test = 1;
}

function imprimer() {
    window.print();
}

function cache(id) {
    var d = document.getElementById(id);
    d.style.display="none";
    d.style.visibility="hidden";
}

function montre(id) {
    var d = document.getElementById(id);
    d.style.display="block";
    d.style.visibility="visible";
}

function verif_mail(id_adr, id_corps) {
    var msg = "";
    var adr = document.getElementById(id_adr);
    var corps = document.getElementById(id_corps);
    exmail=new RegExp("^[A-Za-z0-9]([-_.]?[A-Za-z0-9])*@[A-Za-z0-9]([-.]?[A-Za-z0-9])*\.([A-Za-z]{2,4})$");
    if( !exmail.test(adr.value) ){
        msg += "L'adresse e-mail n'est pas valide.\n";
    }
    if (corps.value == "" || corps.value == "Ecrivez votre texte ici ..."){
        msg += "Votre message est vide !\n";
    }
    if (msg == ""){
        return true;
    }else{
        alert(msg);
        return false;
    }
}

function init_form() {
    flag1 = true;
    flag2 = true;
    flag3 = true;
}

function vide_texte(champ) {
    var a_vider = document.getElementById(champ);
    if (champ == "expediteur" && flag1) {
        a_vider.value = "";
        flag1 = false;
    }else if (champ == "sujet" && flag2) {
        a_vider.value = "";
        flag2 = false;
    }else if (champ == "corps" && flag3) {
        a_vider.value = "";
        flag3 = false;
    }
}