setInterval not working - php

Question

I have tried to make a real time chat, but i have a problem: setInterval (for checking for new messages) does not work :/...
This is my jQuery code
$(function(){
setInterval(function() {
$.ajax({
url: "./ajax/checknew.php",
success: function(data) {
$("#chMsgCont").append(data);
}
});
},1000);
$('#chMsgCont').load('./ajax/msg.php', function() {
var div = $('#chMsgCont');
var o = div.offset().top;
div.scrollTop( o + 12302012 );
});
});
My msg.php
<?php
include("../system/config.site.php");
$query = mysql_query("SELECT * FROM chat_msg ORDER BY timestamp ASC");
while($p = mysql_fetch_assoc($query)) {
$auth = mysql_fetch_assoc(mysql_query("SELECT * FROM chat_users WHERE id = '".$p['auth_id']."'"));
$update = mysql_query("UPDATE chat_msg SET new = 'no' WHERE id = '".$p['id']."'");
?>
<div class="chatMsg">
<p id="chatPMsg">
<span class="chatTime"><?php echo date("H:i", $p['timestamp']); ?></span>
<b><?php echo $auth['name']." ".$auth['surname']; ?></b><br />
<?php echo stripslashes($p['msg']); ?>
</p>
<p id="chatImg">
<img src="./images/thumb<?php echo $p['auth_id']; ?>.png" />
</p>
<div style="clear:both;"><!– –> </div>
</div>
<?php
}
?>
My checknew.php
<?php
include("../system/config.site.php");
$query = mysql_query("SELECT * FROM chat_msg WHERE new = 'yes' ORDER BY timestamp ASC");
if(mysql_num_rows($query) > 0) {
while($p = mysql_fetch_assoc($query)) {
$auth = mysql_fetch_assoc(mysql_query("SELECT * FROM chat_users WHERE id = '".$p['auth_id']."'"));
?>
<div class="chatMsg">
<p id="chatPMsg">
<span class="chatTime"><?php echo date("H:i", $p['timestamp']); ?></span>
<b><?php echo $auth['name']." ".$auth['surname']; ?></b><br />
<?php echo stripslashes($p['msg']); ?>
</p>
<p id="chatImg">
<img src="./images/thumb<?php echo $p['auth_id']; ?>.png" />
</p>
<div style="clear:both;"><!– –> </div>
</div>
<?php
}
} else {
echo "";
}
?>
setInterval refuses to append the results of the query :/, how is it possible?

Answer 1

May it must call window.setInterval() ?