/* form envoi a un ami */
function checkformsf(frm,prm,msg1,msg2) {
  var mail1;
  var mail2;
  var res1;
  var res2;
  mail1 = document.getElementById(frm).email.value;
  mail2 = document.getElementById(frm).emailf.value;
  if ((mail1.indexOf("@")>0) && (mail1.indexOf(".")>0))
    res1=true;
  else {
    alert(msg1);
    document.getElementById(frm).email.focus();
    res1=false;
  }
  if (res1) {
    if ((mail2.indexOf("@")>0) && (mail2.indexOf(".")>0))
      res2=true;
    else {
      alert(msg2);
      document.getElementById(frm).emailf.focus();
      res2=false;
    }
  }
  if (res1 && res2)
    if (prm==0) return true; else document.getElementById(frm).submit();
  else
    if (prm==0) return false; else return;
}