Ajax, add to database and update div content

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Okay, so I am trying to use ajax. I've tried several ways of doing this but nothing is working for me. I believe the main problem I have is that ajax won't add to my database, the rest is managable for me.

Here is the relevant ajax-code:

function posts(){
var xmlhttp;
if (window.XMLHttpRequest){
    xmlhttp = new XMLHttpRequest();
} else {
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
        document.getElementById("threads").innerHTML=xmlhttp.responseText;
    }
}
xmlhttp.open("GET", sessionStorage.page, true);
xmlhttp.send();

}

function update_post(){ var message = $("#message").val();

var dataString = "content=" + message;

$.ajax({
    url: 'post_process.php',
    async: true,
    data: dataString ,
    type: 'post',
    success: function() {
        posts();
    }
});

}

Here is the post_process.php:

<?php
require_once "include/bootstrap.php";   

if (isset($_POST['subject'])){
    $subject = $con->real_escape_string($_POST["subject"]);
    $Qnum = rand();
    die ("if 1");
} else {
    $subject = $_SESSION['subject'];
    $Qnum = $_SESSION['qnum'];
    die ("else 1");
}
$message = $con->real_escape_string($_POST["message"]); 

if (validateEmpty($message) && validateEmpty($subject)){
    send();
    die ("if 2");
} else {
    die ("Error!");
}

function send(){
    global $con, $message, $subject, $Qnum;
    die ("i send()");

    $con->create_post($_SESSION['username'], $_SESSION['category'], $subject, $message, $Qnum);
}

//header("Location: index.php");

?>

And lastly, here is the html-form:

<div id="post_div">
<form name="threadForm" method="POST" action="" onsubmit="return validate_post();">
    <label for="message">Meddelande</label><br>
    <textarea id="message" name="message" id="message" maxlength="500">

    </textarea><br>
    <input type="submit" onclick="update_post()" value="Skicka!" name="post_btn" id="post_btn"><br>
</form>

I've tried putting alert:s in the js-code and die:s in the php-code to see how far it gets and I've concluded that it doesn't call my $.ajax. I've tried using $.post instead with no luck.

asked 47 secs ago

Korpen

3