setting user levels

[dubt2nv]

i currently have a mysql run database website...atm i have a tbale called users which contains the info on the username, password, and login details for ppl.....i also have a field called 'level' where the suers level is recorded, eg Admin, Owner.....i want to be able to set these 2 allow the owner to access everything and only allow the admin to access certain things....how would i do this????

[fert]

[code]
$cn=@mysql_connect("host","username","password") or die(mysql_error());
@mysql_select_db("db_name",$cn) or die(mysql_erro());

$result=@mysql_query("SELECT `level` FROM `users` WHERE `username`=$username",$cn) or die(mysql_error());
$row=mysql_fetch_array($result)
if($row[level]=="owner")
{
echo "owner stuff";
}
else
if($row[level]=="admin")
{
echo "admin stuff";
}[/code]