$(document).ready(function(){
$("form").submit(function(){
var str = $("form").serialize();
   $.ajax({
   type: "POST",
   url: "contact.php",
   data: str,
   success: function(msg){
$("#note").ajaxComplete(function(event, request, settings){
if(msg == 'OK') // Message Sent? Show the 'Thank You' message and hide the form
{
result = '<div class="notification_ok">Your message has been sent. Thank you!</div>';
$("#fields").hide();
}
else
{
result = msg;
}
$(this).html(result);
});
}
 });
return false;
});
});