thanks that's really usefull!!!

i've post this on my blog...
and here u can find more keywords as:

urls['qcic']='http://www.quellicheilcell.it/blog/?s=%s';
urls['wikiit']='http://it.wikipedia.org/wiki/Special:Search?search=%s';
urls['y']='http://it.search.yahoo.com/search?p=%s';
urls['fl']='http://www.flickr.com/search/?q=%s';
urls['yt']='http://www.youtube.com/results?search_query=%s';
urls['fb']='http://www.facebook.com/search/?q=%s';
urls['tw']='http://twitter.com/#search?q=%s';
urls['gim']='http://images.google.it/images?q=%s';