var default_login = 'E-mail';
var default_password = 'пароль';
function login_fild()
{
  var login_fild = document.getElementById('login');
  if (login_fild.value == default_login) {
    login_fild.value = '';
  }
}
function login_blur()
{
  var login_fild = document.getElementById('login');
  if (!login_fild.value) {
    login_fild.value = default_login;
  }  
}
function password_fild()
{
  var password_fild = document.getElementById('password');  
  if (password_fild.value == default_password) {
    password_fild.value = '';
  }  
}
function password_blur()
{
  var password_fild = document.getElementById('password');  
  if (!password_fild.value) {
    password_fild.value = default_password;
  }  
}