jlatex2html: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/jlatex2html - from package: latex2html

You may install the required package with command yum install {package}

Error in other languages:
jlatex2html: bevel nie gevind nie
jlatex2html: comandă negăsită
jlatex2html: comando não encontrado
jlatex2html: commande introuvable
jlatex2html: command not found
jlatex2html: käsku ei ole
jlatex2html: không tìm thấy lệnh
jlatex2html: komanda nerasta
jlatex2html: Kommando nicht gefunden.
jlatex2html: kommandot finns inte
jlatex2html: komut yok
jlatex2html: nie znaleziono polecenia
jlatex2html: níor aimsíodh an t-ordú
jlatex2html: no se encontró la orden
jlatex2html: no s'ha trobat l'ordre
jlatex2html: opdracht niet gevonden
jlatex2html: parancs nem található
jlatex2html: perintah tidak ditemukan
jlatex2html: príkaz nenájdený
jlatex2html: příkaz nenalezen
jlatex2html: команда не найдена
jlatex2html: командата не е открита
jlatex2html: 命令找不到
jlatex2html: コマンドが見つかりません