Можно вставить в форму:
Код:
<!-- Google CSE Search Box Begins -->
<form id="searchbox_017570198198700603454:2g4miqgpmoe" action="http://google.com/cse">
<input type="hidden" name="cx" value="017570198198700603454:2g4miqgpmoe" />
<input name="q" type="text" size="40" />
<input type="submit" name="sa" value="Search" />
<input type="hidden" name="cof" value="FORID:0" />
</form>
<script type="text/javascript" src="http://google.com/coop/cse/brand?form=searchbox_017570198198700603454%3A2g4miqgpmoe"></script>
<!-- Google CSE Search Box Ends -->