<form method="get" action="http://www.google.com/search" name="google">
<input type="hidden" name="ie" value="UTF-8" />
<input type="hidden" name="oe" value="UTF-8" />

<a href="http://www.google.fr/">
<img src="http://www.google.com/logos/Logo_25wht.gif" border="0" alt="Google" align="middle" /></a>
<input type="text" name="q" size="50" maxlength="255" value="" />
<input type="submit" name="btnG" value="Google Search" />
<br />
<input type="radio" name="sitesearch" value="" checked="checked" />Web
<input id="lgr" type="radio" name="meta" value="lr=lang_fr" />Pages francophones
<input id="cty" type="radio" name="meta" value="cr=countryFR" />France
<br />
<input type="radio" name="sitesearch" value="wikipedia.org" />Wikipedia
<input type="radio" name="sitesearch" value="answers.com" />Answers
<input type="hidden" name="hl" value="fr" />
</form>

Un exemple d'utilisation ici