Sessions without cookies : forms

Hi, thanks for all the replies on my two previous postings relating to sessions and cookies. I have set my mind on using sessions but without cookies, so that entails passing the SID via relative URL's. My problem comes in here, when I create a simple login page with a form that send username and password to the next page, I start_session(); and then in the form action, I append the url with <?=SID?> , but that causes two parse errors. Warning: Cannot send session cookie - headers already sent by (output started at /home/www/index.php:3) in /home/www/index.php on line 4 Warning: Cannot send session cache limiter - headers already sent (output started at /home/www/index.php:3) in /home/www/index.php on line 4 The code is like so: <html> <head> <?php session_start(); ?> </head> <body> <form name="form1" method="post" action="admin_select_project.php?<?=SID?>"> <table border="0" cellspacing="0" cellpadding="0"> <tr bgcolor="#CFCFCF">

     <td colspan="2">Admin Login
     </td>

</tr> <tr>

     <td>Username:
     </td>
     <td><input type="text" name="username">
     </td>

</tr> <tr>

     <td>Password:
     </td>
     <td><input type="text" name="password">
     </td>

</tr> <tr>

     <td>
       <input type="submit" name="Submit4" value="Submit">
     </td>

</tr> </table> </form> </body> </html> What am I missing... Thanks