session cookies help

[cab]

can anyone tell me what is wrong?

my script ...

<link rel="stylesheet" href="surplus.css" type="text/css">

<?php
session_start();
$UserLoggedOn = $user;
$PasswordLoggedOn = $pwd;

// connect to database
include("connection.php");

// is the user a valid user?
$qry = "SELECT username,password FROM logon WHERE username= '$user' AND password= '$pwd'";

$result = mysql_query($qry,$link);
$rows = mysql_num_rows($result);

if ($rows==0)
// invalid user
{
echo "<font color=\"#FF0000\" size=\"3\" face=\"Arial\"><b>";
echo "<center>I AM SORRY YOUR USERNAME AND PASSWORD WERE NOT RECOGNISED - PLEASE TRY AGAIN!";
echo "</font></b></font>";
include ("logonShippingDetails.php");
}
else
// valid user
{
// has the user already added shipping details
$qry = "SELECT username,password FROM shipping_details WHERE username= '$user' AND password= '$pwd'";
mysql_query($qry,$link);
$result = mysql_query($qry,$link);
$row = mysql_fetch_row($result);
// echo $result; // test stub
// echo $row[0]; // test stub
// echo $row[1]; // test stub
if ($row==0)
// query failed - user not yet registered - display blank form
{
header ("Location: ShippingDetailsForm.php?user=$user&pwd=$pwd");
}
else
// query ok - user registered - display form for amendment
{
header ("Location: ShippingDetailsUpdate.php?user=$user&pwd=$pwd");
}
}

// close the database connection
mysql_close();

?>

and the errors ...

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /files/home3/callaway/surplus/ShippingDetails.php:3) in /files/home3/callaway/surplus/ShippingDetails.php on line 4

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /files/home3/callaway/surplus/ShippingDetails.php:3) in /files/home3/callaway/surplus/ShippingDetails.php on line 4

Warning: mysql_query(): supplied argument is not a valid MySQL-Link resource in /files/home3/callaway/surplus/ShippingDetails.php on line 14

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /files/home3/callaway/surplus/ShippingDetails.php on line 15

[Trs2988]

Very easy to fix. You must call session_start() before you print out anything on the page. You are trying to print the link to the style sheet first, and that just doesn't work.

Change around the top of your file to this:

<?php
session_start();
echo "<link rel=\"stylesheet\" href=\"surplus.css\" type=\"text/css\">";
// Rest of script here...

That takes care of the first two errors. The second two mean that there is something wrong with your first MySQL query. Check the names of tables and fields against your database to make sure they're all correct.