<form action="https://ВАШ САЙТ" id="cse-search-box">      
      <div>      
      <input type="hidden" name="cx" value="partner-pub-2552537688454945:dg404m-yrp0" />      
      <input type="hidden" name="cof" value="FORID:10" />      
      <input type="hidden" name="ie" value="UTF-8" />      
      <input type="text" name="q" size="31" />      
      <input type="submit" name="sa" value="Поиск" />      
</div>      
</form>      
<script type="text/javascript" src="http://www.google.ru/coop/cse/brand?form=cse-search-box〈=ru"></script>

<div id="cse-search-results"></div>      
<script type="text/javascript">      
      var googleSearchIframeName = "cse-search-results";      
      var googleSearchFormName = "cse-search-box";      
      var googleSearchFrameWidth = 800;      
      var googleSearchDomain = "www.google.ru";      
      var googleSearchPath = "/cse";      
</script>      
<script type="text/javascript" src="http://www.google.com/afsonline/show_afs_search.js"></script>