.load() When loaded page change - php

Question

here is my problem - i have Div with include "file.php" with content of Database then i Insert new data to database and want to reload .load() file.php to div but content is same until i refresh the page. Someone who know what it is ?
File.php
<?php
include "../lib/dbconnect.php";
$class = $_GET['class'];
$get_posts = mysql_query("SELECT content, date, author, author_id FROM classPosts WHERE class = '$class' ORDER BY id DESC");
while (list($content, $time, $author, $author_id) = mysql_fetch_row($get_posts)){
$get_user_name = mysql_query("SELECT name, lastName FROM users WHERE nick = '$author'");
while (list($name, $lastName) = mysql_fetch_row($get_user_name)){
$time = new Cokidoo_DateTime("#" . $time);
echo "
<div class=\"div\">
<div class=crop-small title=\"$author\">
<a href=/user/user.php?user=$author_id><img src=/user/pics/$author_id.jpg class=img-small></a>
</div>
<span class=small-text><b style=\"color: rgb(100,100,100)\">$name $lastName</b><br>
<span class=\"small-text\">Přezdívka <b style=\"color: rgb(100,100,100)\">$author</b></span><br>
Přidáno $time</span><p><br></p>
<span class=\"small-text\">$content</span>
</div>
";
}
}
?>
there is Javascript
if(data.success)
{
$("#class_posts").fadeOut(function(){
$("#new_post").hide(0);
$("#class_posts").load("../trida/get_posts.php");
$("#class_posts").fadeIn();
$("#new_post_text").html("");
});
}

Answer 1

try appending a random number on the end as a query string - to prevent caching.
var randNum = Math.floor(Math.random() * 999999);
$("#class_posts").load("../trida/get_posts.php?"+randNum);