<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="&#x041f;&#x043e;&#x0438;&#x0441;&#x043a;" />

  </div>
</form>

<script type="text/javascript" src="http://www.google.ru/coop/cse/brand?form=cse-search-box&amp;lang=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>