PHP Chat, on a Free hosting Forum

[Agent Moose]

I am trying to create a PHP chat on a free forum service (smfforfree).
Here is a link to it:
http://smctest.smfforfree3.com/pages/smctest/test.php

There are two problems:
1. When you click the Send Button, it brings you to the shout.php file.
2. The shouts don't show up. Could that be because I am using the same database for another page?

Here are the files I have:
database.php

<?php
$db_user = "3823_simchat";
$db_pass = "--------------";
$db_database = "3823_simchat";
$db_host = "mysql";
$db_connect = mysql_connect ($db_host, $db_user, $db_pass);
$db_select = mysql_select_db ($db_database);
?>

shout.php

<?php
require("database.php");

function secure($string){
$string = strip_tags($string);
$string = trim($string);
$string = htmlspecialchars($string);
$string = stripslashes($string);
$string = mysql_real_escape_string($string);
return $string;
}

$message = secure($_POST['msg']);
$username = secure($_POST['postee']);

if($message == ""){
header("Location: shoutbox.php");
exit;
}

$date = date("Y-m-d H:i:s",time());
mysql_query("INSERT INTO rawr(poster,message,date) VALUES('$username','$message','$date')") or trigger_error("Error querying database. Please contact the administrator.");
header("Location: shoutbox.php");
mysql_close($db_connect);
?>

shoutbox.php

<?php
require("database.php");

$the_box = mysql_query("SELECT * FROM `rawr` ORDER BY date DESC LIMIT 0,40");
$chat_rows = mysql_num_rows($the_box);

if($chat_rows == 0){
$Mess = "No Messages";
}
while($msz = mysql_fetch_array($the_box)){
$Mess = $msz['poster'] . "(" . date('M jS, Y, g:i:s A',strtotime($msz['date']) - 5 * 60 * 60) . "): " . $msz['message'] . "<br />";
}
?>

var name = document.getElementsByTagName("span");
for(v=0;v<name.length;v++){
if(name[v].innerHTML.match(/Hello <b>(.*)<\/b>/i)){
var Username = RegExp.$1;
};};

var Shoutbox = "";
Shoutbox += "<form action='http://yort124.ulmb.com/smfshout/shout.php' method='POST'>";
Shoutbox += "";
Shoutbox += "<table width='500px'>";
Shoutbox += "<tr><td width='100%' height='100px'>";
Shoutbox += "<div style='overflow: auto; height: 300px; width: 100%; border: 1px solid black;' id='shoutarea'>";

Shoutbox += "<?php echo $Mess; ?>";

Shoutbox += "</div></td></tr>";
Shoutbox += "<tr><td><textarea type='text' name='msg' width='100%'></textarea></td></tr>";
Shoutbox += "<tr><td><input type='submit' name='submit' value='Send'><input type='button' onclick='javascript:window.location.reload();' value='Reload'/><input type='hidden' value='" + Username + "' name='postee'></td></tr>";
Shoutbox += "</table>";
Shoutbox += "</form>";

document.write(Shoutbox);

You will notice that in the shoutbox.php I use PHP and javascript.

Anway, like I said above. When I click on the Send button, it sends me to the shout.php file.

I know it is because of the header("Location: shoutbox.php"); part, but how would I make it so it sends the information, and still goes back to the page it is on?

[Agent Moose]

Hmm...so no one knows how to fix the problem?