webbando on "Search Permalink: replace string "?s=" to permalink structure"

Hi,

is it possible to change the normal string ?s= to a permalink structure?

In particular I need to have the following url:

http://www.sitedomani.com/search/keyword1-keyword2-keyword3

instead of:
http://www.sitedomani.com/?s=keyword1+keyword2+keyword3

So, I need to delete "?s=" and replate the "+" with the "-".

Is it possible?