How to customize search option in search module

Excuse bad english, I try to explain what I would want .

- Visitor search a key in search engine (Google, Yahoo ...)
- the visitor chooses and enter in my gallery
- in the search module of my gallery it comes inserted the key

It is possible?

Versione di Gallery = 2.2.1 core 1.2.0.1
Versione PHP = 4.4.4 apache2handler
Webserver = Apache/2.0.59 (Unix) mod_ssl/2.0.59 OpenSSL/0.9.7a PHP/4.4.4 FrontPage/5.0.2.2634 mod_perl/2.0.3 Perl/v5.8.5
Database = mysql 4.1.22-standard, lock.system=flock
Strumenti = ArchiveUpload, Exif, Getid3, NetPBM, Thumbnail, Gd, LinkItemToolkit
Accelerazione = none, none
Sistema operativo = Linux roar2.netjaguar.com 2.6.9-42.0.8.EL #1 Tue Jan 30 12:10:22 EST 2007 i686
Tema predefinito = PGtheme
gettext = abilitato
Locale = it_IT