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[NTLDR]

Find:

PHP Code:

ORDER BY dateline $postorder LIMIT ".($limitlower-1).",$perpage
"); 


Replace with:

PHP Code:

ORDER BY dateline $postorder ".iif($action != 'showall', "LIMIT ".($limitlower-1).",$perpage", '')
); 


Then use showthread.php?action=showall&threadid=THETHREADID (ie add action=showall to the URL).

Untested but it should work.