$(document).ready(function(){
   setTimeout(function(){
  $("div.mydiv").fadeOut("slow", function () {
  $("div.mydiv").remove();
      });
 
}, 2000);
 });

http://papermashup.com/jquery-fading-a-div-after-a-certain-time/

Here’s a handy bit of code that I use quite regularly, its particularly useful if your getting a response message from a form to notify the user that there data was sent, or comunicate an error and you want to fade the message out after a set time.

Fading out a div after set time with jQuery

jquery

JavaScript