Hi,

I am getting these errors :

Code:
Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /home/box/public_html/im/launch.php:29) in /home/box/public_html/im/launch.php on line 40

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/box/public_html/im/launch.php:29) in /home/box/public_html/im/launch.php on line 40

Warning: Cannot modify header information - headers already sent by (output started at /home/box/public_html/im/launch.php:29) in /home/box/public_html/im/launch.php on line 42

Warning: Cannot modify header information - headers already sent by (output started at /home/box/public_html/im/launch.php:29) in /home/box/public_html/im/launch.php on line 43
Here are lines 40 to 46 :

Code:
session_start();
$_SESSION['sid'] = "sid";
setcookie("sid", sid, time()+3600);
setcookie("sid", $_GET["uname"], time()+3600);
$CheckInTime = Time();
$query="INSERT INTO `NetImOn` (`U_Name`, `LoginTime`, `SessionId`) VALUES ('".$_GET["uname"]."', '".$CheckInTime."', '".session_id()."')"  or die(mysql_error()); 
mysql_query($query);
Can anyone please tell me what is wrong with the following error, thank you.

Jf3000