<!-- Use of this code assumes agreement with the Google Custom Search Terms of Service. -->
<!-- The terms of service are available at /coop/docs/cse/tos.html -->
<form name="cse" id="searchbox_demo" action="http://www.google.com/cse">
  <input type="hidden" name="cref" value="" />
  <input name="q" type="text" size="40" />
  <input type="submit" name="sa" value="Search" />
</form>
<script type="text/javascript" src="http://www.google.com/cse/tools/onthefly?form=searchbox_demo"></script>

http://www.google.com/coop/cse/onthefly

Google Custom Search Engine from a List of Links

search, google

HTML