function quoted(str) {
  return (str != null) ? '"' + str + '"' : '""';
}

function append_url(param, value) {
  if (value) {
    window.ad_url += '&' + param + '=' + value;
  } else {
  	window.ad_url += '&' + param + '=';
  }
}

function upper(param) {
		if (param) {
			return param.toUpperCase();
		}
		return "";
}

function show_ad() {
			var w = window;
			w.page_url = document.referrer;
			w.ad_url = 'http://ring.onep.jp/amazon.cgi?'+'id='+window.onep_id;
			append_url('aid',window.aid);

			append_url('alc',upper(window.alternate_color));
			append_url('bdc',upper(window.color_border));
			append_url('bgc',upper(window.color_bg));
			append_url('lkc',upper(window.color_link));
			append_url('ulc',upper(window.color_url));
			append_url('txc',upper(window.color_text));


      document.write('<ifr' + 'ame' +
                     ' name="onepring"' +
                     ' width=' + "120" +
                     ' height=' + "200" +
                     ' frameborder=0' +
                     ' src=' + quoted(w.ad_url) +
                     ' marginwidth="0"' +
                     ' marginheight="0"' +
                     ' vspace="0"' +
                     ' hspace="0"' +
                     ' allowtransparency="true"' +
                     ' scrolling="no">');
      document.write('</ifr' + 'ame>');
}

show_ad();