$ftp->cwd($i2) or die "change directory $i2: ".$ftp->message." / ".$ftp->code;
my @nfiles = $ftp->dir;
if(grep {$_ eq $i3} @nfiles){
die "make $i3: already exists";
} else {
$ftp->mkdir($i3) or die "make directory ".$ftp->code;
}

##</code><code>##

push @errs,"cannot change directory from $ftp->pwd to i2: $ftp->message" unless $ftp->cwd($i2);
my @nfiles = $ftp->dir;
push @errs,"cannot list directory $ftp->pwd: $ftp->message" unless @nfiles;
push @errs,"directory $n2 already exists in $ftp->pwd: $ftp->message" if grep {$_ eq $n2} @nfiles;
push @errs,"cannot make directory $n2 in $ftp->pwd: $ftp->message $ftp->code" unless $ftp->mkdir($n2);

$ftp->quit;
if(@errs){ print join "<br />",@errs; }