<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>