AJAX ERROR?

/* chatlog.php */

<?php
session_start();

include "connect.php";

$room = $_SESSION['room'];
$getnummessages="SELECT COUNT(*) as messagecount from tbl_chatmessages";
$getnummessages2=mysql_query($getnummessages) or die("blah");
$getnummessages3=mysql_result($getnummessages2, 0);

if($getnummessages3>21)
	{
		$startrow=$getmessages3-20;
	}
else
	{
		$startrow=1;
	}

date_default_timezone_set ("Asia/Manila");
                        $date = date("Y-m-d");

$getmsg="SELECT * from tbl_chatmessages a, jcow_accounts b WHERE a.room_number='$room' && b.username=a.user_alias && a.date='$date' ORDER BY postime DESC";
$getmsg2=mysql_query($getmsg) or die(mysql_error());

while($getmsg3=mysql_fetch_array($getmsg2))
	{
		$message=Smiley($message); //Smiley faces

print "<div id='loaddiv'><div id='tablechatter'><table name='tablechat' id='tablechat' cellspacing='0' cellpadding='0' style='margin-top:10px;margin-left:0px;padding:0px;'>";
		print "<tr><td rowspan='2'><a href='index.php?p=u/$getmsg3[user_alias]' target='_blank'><img src='http://www.pinoyarea.com/uploads/avatars/$getmsg3[avatar]' width='50px' height='50px'/></td><td><font color='#333333' style='text-decoration:none;font-size:14px;font-family:tahoma;'><b>&nbsp;$getmsg3[name]</b></font></a> <font color='#666666' style='text-decoration:none;font-size:10px;font-family:tahoma;'>($getmsg3[time]):</font></td></tr><tr><td><font style='font-family:tahoma;font-size:12px;'>&nbsp;$getmsg3[message]</font></td></tr>";
print "</table>";
print "</div>";
}

function Smiley ($texttoreplace)
	{
		$smilies = array
		(
			':)' => "<img src='images/smile.gif'>",
			':blush' => "<img src='images/blush.gif'>",
			':angry' => "<img src='images/angry.gif'>",
			':o' => "<img src='images/shocked.gif'>",
			'fuck' => "$#$%",
			'Fuck' => "&$#@",
			'bitch' => "$#%@&"
		);

		$texttoreplace=str_replace(array_keys($smilies),array_values($smilies),$texttoreplace);
		return $texttoreplace;
	}




?>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script>
$.ajaxSetup({ datatype: "html" });
var auto_refresh = setInterval(
function()
{
$('#loaddiv').load('chatlog.php?alt=json-in-script&callback=?');
}, 5000);
</script>



/* submit.php */

<?php
//if(isset($_POST['submit'])) //if submit button push has been detected
//{
	session_start();
	include "connect.php";
	$message=$_POST['message'];
	$name = $_SESSION['username'];
    $room = $_SESSION['room'];
    $user = $_SESSION['user'];

$sql_row = mysql_query("SELECT * FROM tbl_chatmessages ORDER BY postime DESC");
$count_row = mysql_num_rows($sql_row);
	if(strlen($message)<1)
		{
			//print "<//script>alert('You did not input a message');<//script>";
		}
	else if(strlen($name)<1)
		{
			//print "<script>alert('You did not enter a name, please try again.');<//script>";
		}
    else if($count_row >= 50)
		{
        	mysql_query("DELETE FROM tbl_chatmessages ORDER BY postime ASC LIMIT 1");

       		date_default_timezone_set ("Asia/Manila");
        	$date = date("Y-m-d");
       		$time = date("H:i:s");
       		$real_time = DATE("g:i a", STRTOTIME($time));
     	    $message=strip_tags($message);
			$IP=$_SERVER["REMOTE_ADDR"]; //grabs poster's IP
       		$id=rand(11111111111111111111,99999999999999999999);
			$thedate=date("U"); //grab date and time of the post
			$insertmessage="INSERT into tbl_chatmessages (id,name,ip,postime,date,time,message,room_number,user_alias) VALUES ('$id','$name','$IP','$thedate', '$date' , '$real_time' ,'$message','$room','$user')";
			mysql_query($insertmessage) or die("Could not insert message");
		}
	else
		{
            date_default_timezone_set ("Asia/Manila");
            $date = date("Y-m-d");
            $time = date("H:i:s");
            $real_time = DATE("g:i a", STRTOTIME($time));
            $message=strip_tags($message);
			$IP=$_SERVER["REMOTE_ADDR"]; //grabs poster's IP
            $id=rand(11111111111111111111,99999999999999999999);
			$thedate=date("U"); //grab date and time of the post
			$insertmessage="INSERT into tbl_chatmessages (id,name,ip,postime,date,time,message,room_number,user_alias) VALUES ('$id','$name','$IP','$thedate', '$date' , '$real_time' ,'$message','$room','$user')";
			mysql_query($insertmessage) or die("Could not insert message");
		}
//}



$sql ="SELECT emote, image FROM emoticons";
$result=mysql_query($sql);

print "<link rel=\"stylesheet\" type=\"text/css\" href=\"who-is-online/styles.css\" />";


print "<center><div id='form'>";
print "<div class=\"onlineWidget\"><img class=\"arrow\"><div class=\"panel\"><img class=\"preloader\" src=\"who-is-online/img/preloader.gif\" alt=\"Loading..\" width=\"22\" height=\"22\" /></div></div>";
print "<br/><form method='post' id='form' name='form'>";
print "<input type='text' id='message' name='message' rows='0' width='300px' size='55' style='margin-top:0px;margin-bottom:0px;margin-left:0px;'></textarea>";
print "<input type='submit' class='submit' id='submit' name='submit' value='Send'></form>";
print "<script language=\"Java Script\" type=\"text/javascript\">\n";
print "function addSmiley(textToAdd)\n";
print "{\n";
print "document.form.message.value += textToAdd;";
print "document.form.message.focus();\n";
print "}\n";
print "</script>\n";

print "</div></center>";
?>

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
	$(function(){
		$(".submit").click(function(){
			var message = $("#message").val();
			var dataString = 'message'+message;
			$.ajax({
				type: "POST",
				url: "submit.php?alt=json-in-script&callback=?",
				var dataString = {'message' : message };
			});
			/*$message=$_POST['message'];
	$name = $_SESSION['username'];
    $room = $_SESSION['room'];
    $user = $_SESSION['user'];*/
		});
	});
</script>