function random( $max )
{
$x = rand();
$y = getrandmax();
$r = $x / $y * ($max -1 );
$r = round( $r++ );
return $r;
}
$i = 0;
$d = dir( ".");
while($entry=$d->read())
if (substr($entry,0,6) == "banner")
$array[$i++] = $entry;
$d->close();
$r = random( $i );
Header( "Pragma: no-cache" );
Header( "Expires: Monday 01-Jan-80 12:00:00 GMT" );
Header( "Content-type: image/gif");
passthru( "cat $array[$r]" );
?>