var inProgress = false;
var strMsg;

function Valid() {

    if (inProgress)
        return false;

    F = document.form1

    strMsg = "";

	IsEmpty(F.txtNom.value, "Nom");
	IsEmpty(F.txtPrenom.value, "Prénom");
	IsEmpty(F.txtAdresse.value, "Adresse");
	IsEmail(F.txtMail.value, "E-mail");
	IsEmpty(F.rdQuestion.value, "Question");

    if (strMsg != "") {
        alert(strMsg);
        return false;
    }

    window.open("", "frmcontact", "toolbar=0,location=0,directories=0,scrollbars=1,resizable=1, status=0,menubar=0,width=530,height=400,left=5,top=5");

    inProgress = true
    return true;
}