js4online_homework/01/main.js

var attempt = 333;
function validate() {
   var username = document.getElementById("username").value;
   var password = document.getElementById("password").value;
   if (username == "admin" && password == "qwerty") {
      document.write("<div style='color:green'>Вы успешно зарегистрировались!</div>");
      return false;
   }
   else {
      attempt--;
      document.write("<div style='color:red'>Неверный логин или пароль!</div>");
      if (attempt == 0) {
         document.getElementById("username").disabled = true;
         document.getElementById("password").disabled = true;
         document.getElementById("submit").disabled = true;
         return false;
      }
   }
}