Unable to intall quick reply

[alwl]

Hi, would appreciate if anyone can give me some help.

I'm trying to install Firefly's quick reply hack, the first step to find and replace code in showthread.php:

if (!$getperms['canviewothers'] and ($thread['postuserid']!=$bbuserinfo['userid'] or $bbuserinfo['userid']==0)) {
  show_nopermission();}

if ((!isset($pagenumber) or $pagenumber==0) and $pagenumber!="lastpage") {
  $pagenumber=1;
}

I can't find the following part on my showthread.php

if ((!isset($pagenumber) or $pagenumber==0) and $pagenumber!="lastpage") {
  $pagenumber=1;
}

I'm using 2.3.1