trouble with session session

[Anon]

hi,
im new to php programming and have a doubt abt having sessions.
i have this bit of code in my page
session_start();

session_register("custid");

$HTTP_SESSION_VARS["custid"]="abc";

echo $custid;

when i run this script, i get a "Cannot send session cache limiter - headers already sent"
error. why is this? am i writing the code wrong?
this code is to start a session when a user logs in. ps help.
cartic

[Anon]

The beginning of your page should look like this:
<?php
session_start();

etc.

As I understand it, you can't have any HTML or php code before your session_start() is called. Not even whitespace before your php tag I believe (whitespace inside the tag is ok).

Hope this helps...