function amazonSearch() {
  var url = '/cgi-bin/apf4/amazon_products_feed.cgi';
  var pars = 'Operation=ItemSearch&SearchIndex=Books&templates=inline&Keywords='+$F('input_string');
  var target = 'searchResults';
  var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
	return false;
}