problem with starting a session

["Ahmed Abdelaliem" <ahmed_abdelaliem@hotmail.com>]

hi,
i have a problem with starting a session in the page that validates the user 
input and sends it tothe database,
when the user clicks register he gets this error

Warning: session_start(): Cannot send session cookie - headers already sent 
by (output started at c:\inetpub\wwwroot\ads4u\data_valid_fns.php:25) in 
c:\inetpub\wwwroot\ads4u\register_new.php on line 89

Warning: session_start(): Cannot send session cache limiter - headers 
already sent (output started at 
c:\inetpub\wwwroot\ads4u\data_valid_fns.php:25) in 
c:\inetpub\wwwroot\ads4u\register_new.php on line 89


and here is the code i wrote :

<?
    $email=$HTTP_POST_VARS['email'];
    $passwd=$HTTP_POST_VARS['passwd'];
    $passwd2=$HTTP_POST_VARS['passwd2'];
    $title=$HTTP_POST_VARS['title'];
    $name1=$HTTP_POST_VARS['name1'];
    $name2=$HTTP_POST_VARS['name2'];
    $phone=$HTTP_POST_VARS['phone'];
    $mobile=$HTTP_POST_VARS['mobile'];
    $address1=$HTTP_POST_VARS['address1'];
    $address2=$HTTP_POST_VARS['address2'];
    $town=$HTTP_POST_VARS['town'];
    $pb=$HTTP_POST_VARS['pb'];
    $country=$HTTP_POST_VARS['country'];
    $occupation=$HTTP_POST_VARS['occupation'];

session_start();


if (!filled_out($HTTP_POST_VARS)){
   echo "You Haven't filled your registeration details correctly, Please go 
back and try again";
   exit;
   }

if (!valid_email($email)){
   echo "That is not a valid email address. Please go back and try again.";
   exit;
   }
if ($passwd != $passwd2){
   echo "The passwords you entered do not match - please go back and try 
again.";
   exit;
   }

if (strlen($passwd)<6 || strlen($passwd) >16){
   echo "Your password must be between 6 and 16 characters Please go back 
and try again.";
   exit;
}




   can anyone tell me please where is the problem and how to solve it,

i test those scripts on my local server IIS, i use windows XP and last 
version of PHP and MYSQL,




thanks

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