if I understood Your problem correct and You want to create a "rolling monthbar" this should be the solution:
<?php
$lang['months'] = array
( 1 => "Januari", 2 => "Februari", 3 => "Maart", 4 => "April", 5 => "Mei",
6 => "Juni", 7 => "Juli", 8 => "Augustus", 9 => "September", 10 => "Oktober",
11 => "November", 12 => "December"
);
function showMonths($montharray)
{ $month = sprintf("%d", date("m"));
$year = date("Y");
for ($inx=$month; $inx<=12; $inx++)
echo "<a href='welkom.php?welkom_id=6&month=$inx&year=$year&do=$inx'>$montharray[$inx]</a> ";
$year++;
for ($inx=0; $inx<$month; $inx++)
echo "<a href='welkom.php?welkom_id=6&month=$inx&year=$year&do=$inx'>$montharray[$inx]</a> ";
}
showMonths($lang['months']);
?>