id type=integer(INT) , auto increment, length =255

<?php
//logged.php
//authentication script
//connection script
//if connection success
$insert=mysql_query("INSERT into onlinenow (name) VALUES ('$_GET[username]')")or die(mysql_error());
header('location:game.php');

//if authentication or connection fails, redirect them to an error page.
?>
-----
<?php
//game.php
//suppose you have a box display game data
//in that box, you want to show NUMBER of people online

$onlinecount=mysql_query("SELECT * from onlinenow");
$ocount=mysql_num_rows($onlinecount);
echo "Number of users online now: ".$ocount." ";
?>
------
<?php
//onlinenow.php
//i wont be dividing results into different pages

echo "<table border=1><tr><th colspan=3>ONLINE NOW</th></tr>";
echo "<tr><td>ID</td><td>NAME</td><td>OPTIONS</td></tr>";
$oselect=mysql_query("SELECT * from onlinenow");
while($online=mysql_fetch_array($oselect))
{
echo "<tr><td>".$online['id']."</td><td>".$online['username']."</td>";
echo "<td><a href='profile.php?a=$_SESSION[username]&s=$s&profile=$online[name]'>Visit Profile</a></td></tr>";
}
echo "</table>";
?>