potresti fare ciò


<script>
function invia(valo){
q='?q=site:www.giulioferri.it '+valo
location.href='http://www.google.com/search'+q
//document.pluto.submit()
}
</script>
<FORM method=GET action="" name="pluto">
<TABLE bgcolor="#FFFFFF">
<tr>
<td>
<div align="center">
<A HREF="http://www.google.com">

</A>

<INPUT TYPE=text name=q size=25 maxlength=255 value=" " class=forminput>

<INPUT TYPE=hidden name=hl value=it>
<INPUT type=button onClick="invia(document.pluto.q.value)" name=btnG VALUE="Cerca" class=formbutton>
</div>
</td>
</tr>
</TABLE>
</FORM>