Thanks Gramps.
I think I put it in the wrong place.
This is my source code:
<script type="text/javascript">
// Google Internal Site Search script- By JavaScriptKit.com (http://www.javascriptkit.com)
// For this and over 400+ free scripts, visit JavaScript Kit- http://www.javascriptkit.com/
// This notice must stay intact for use
//Enter domain of site to search.
var domainroot="www.google.com"
function Gsitesearch(curobj){
curobj.q.value="site:"+domainroot+" "+curobj.qfront.value
}</script>
<input name="q" type="hidden" />
<input name="qfront" type="text" style="width: 180px" /> <input type="submit" value="Search" />
</div>
