How to display a DIV or not, based on whether a logging session cookie exists or not?

Hi everyone
I have created a logging system for a simple CMS using Dreamweaver server behaviours.
My problem :
When logged in, I would like to show on my pages a DIV saying something like "You are logged in". If not logged in, I would like a different DIV with this text saying "Please log in"
I have simplified the problem as much as I could. Basically, I would like to show something or to hide it and show another thing based on whether the logging session exists or not. Would someone have a simple answer to this problem?
Much obliged, W

Thanks HJ
Your answer helped me find more info about cookies and session which is what I actually needed.
So I can show a particular item based on whether an admin user is logged in, I proceed as follow.
First I check whethet the session exists. If he has just logged in using Dreamweaver logging system, the session will exist. So put the text above the <head> and preferably at the very top of the page.
<?php
if (!isset($_SESSION)) {
session_start();
?>
Then in the content portion of the page where I want to display, say a DIV with some content for the administrator I place the following :
<?php
$accessLevels = array('a','b');
$validLevel = $_SESSION['MM_UserGroup'];
if(array_search($validLevel, $accessLevels)>-1){
?>
<div id="amendPage" style="margin-left:0;margin-top:0;height:20px;"><a href="/admin/changePage.php">Changez le contenu de cette page</a></div>
<?php
?>
I am checking here whether the user is logged in based on his or her access level which I have previously set in the database. 'a' being an access level and 'b' an other one which might enable more things. So I can play with this array to show something to someone based on the access level.
If I were to remove 'b' from the array, the div would only be visible when a user with an 'a' access level is logged in and vice versa.
Not sure whether this is a good option, but it works for me

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"Leburn98" <[email protected]> wrote in
message
news:[email protected]...
> How to display data from a recordset based on data from
another recordset.
>
> What I would like to do is as follows:
>
> I have a fantasy hockey league website. For each team I
have a team page
> (clubhouse) which is generated using PHP/MySQL. The one
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> to
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