function jprot(){
    var password = "you suck" ;   // The desired password (change it here!)
    var message = "Enter the coupon code";      
         // The message to show when the user is prompted for the password
    var incmess = "Incorrect coupon code! Access denied!";
         // The message to show if the password is incorrect
    var pw = prompt (message,"");
    if (pw != password) {
      alert (incmess);
      window.history.back ();
    }
  }