> function check_valid()
> {
>   global $valid_user;
>   if (session_is_registered("valid_user"))
>   {
>       echo "<font size='2'>Welcome $valid_user!</font>";
>   }
>   else
>   {
>      echo "You are not logged in.";
>      exit;
>   }
> }

try it like this:

function check_valid()
{
  global $valid_user;
  if (isset($_SESSION['valid_user']))
  {
...

Regards Sascha

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