Is there a possibility to download a website that has its internal search php
module like for example this Croatian dictionary:

<http://hjp.novi-liber.hr/>

You can type words on the left side, for example "pisati", then Enter and the
website will search the its meaning.

I've downloaded the website but when I want to proceed with it it always goes
back on-line.

Can this site (and other like this) be downloaded in such a way that it will
be fully functional off-line with this search module?