custom search urls

Hi

is it possible to do a search of punbb with a custom search box outside of punbb...this searchbox would just insert whatever word was entered at the end of an url.

at the moment a search for "sharks" on this forum looks like this:

http://punbb.org/forums/search.php?search_id=450241131

is there a way of doing it so that it could look like this:

http://punbb.org/forums/search.php?search_id=sharks

or could someone tell me how "sharks" becomes "450241131"

I am trying to code a custom, universal search box for punbb.