The violin doesn't work. No response to the button.

[morde]

Html:

<input type="text" placeholder="Имя" id="name" name="name"></br> 
  <input type="text" placeholder="E-mail" id="email" name="email"></br> 
  <input type="text" placeholder="Тема сообщения" id="subject" name="subject"></br> 
  <textarea name="message" id="message"></textarea></br>
<input type="button" name="done" id="done" value="Отправить">

Js:

$(document).ready(function(){
  $("#done").click(function({
   var name= $("#name").val();
   var email= $("#email").val();
   var subject= $("#subject").val();
   var message= $("#message").val();
   var fail="";
if(name.length<3) fail="Имя не меньше трех символов";
   else if(email.split('@').length-1==0||email.split('.').length-1==0)
       fail="Вы ввели некорректный email";
   else if(subject.length<5)
        fail="Тема сообщения не менее 5 символов";
   else if(message.length<20)
        fail="Сообщение не менее 20 символов";
   if(fail!=""){
        $('#messageShow').html(fail+"<div class='clear'><br></div>");
        $('#messageShow').show();
        return false;           
                }
$.ajax({
    url:'/ajax/feedback.php',
    type:'POST',
    cache: false,
    data:{'name':name,'email':email,'subject':subject,'message':message},
    dataType:'html',
    success: function(data){                
      $('#messageShow').html(data+"<div class='clear'><br></div>");
      $('#messageShow').show();
    }
});

});

});

[irl]

You have a seal in your code. There is no closure in this place:

$("#done").click(function({

Must be like this:

$("#done").click(function(){