function genadresse( utilisateur ) {    
    var domain = "webmastaz";           
    var pays   = "net";                   
    var atsign = String.fromCharCode(64);
    var point  = String.fromCharCode(46);
    var adr =  utilisateur + atsign + domain + point + pays;
    document.write(
    "<" + "a" + " " + "href=" + "ma" +String.fromCharCode(105) + "lto" +String.fromCharCode(58) + adr +">" + adr + "");
  }