function randomAdv() {
  m = 0, x = 0, y = 0;
  ad  = new Array();
  adv = new Array();
  hit = new Array();


hit[0] = 1; adv[0] = '<tr><td rowspan="2"><img src="images/lineup/lotte.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>雪見だいふく</td></tr>';
hit[1] = 1; adv[1] = '<tr><td rowspan="2"><img src="images/lineup/akagi.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>デッカルチェ<br>(ティラミス)</td></tr>';
hit[2] = 1; adv[2] = '<tr><td rowspan="2"><img src="images/lineup/haagendazs.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>ハーゲンダッツ<br>ドルチェ<br>木苺の<br>ミルフィーユ</td></tr>';
hit[3] = 1; adv[3] = '<tr><td rowspan="2"><img src="images/lineup/futaba.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>チョコバナナ<br>マルチ</td></tr>';
hit[4] = 1; adv[4] = '<tr><td rowspan="2"><img src="images/lineup/kracie.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>豆乳アイス<br>Soy＜ソイ＞<br>バニラ</td></tr>';
hit[5] = 1; adv[5] = '<tr><td rowspan="2"><img src="images/lineup/marunaga.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>白いたいやき<br>アイス</td></tr>';
hit[6] = 1; adv[6] = '<tr><td rowspan="2"><img src="images/lineup/meinyu.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>明治 エッセル<br>スーパーカップ<br>ストロベリーチョコ</td></tr>';
hit[7] = 1; adv[7] = '<tr><td rowspan="2"><img src="images/lineup/morinaga.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>チョコモナカ<br>ジャンボ</td></tr>';
hit[8] = 1; adv[8] = '<tr><td rowspan="2"><img src="images/lineup/glico.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>パリッテ</td></tr>';
hit[9] = 1; adv[9] = '<tr><td rowspan="2"><img src="images/lineup/imuraya.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>ＢＯＸ<br>あずきバー</td></tr>';
hit[10] = 1; adv[10] = '<tr><td rowspan="2"><img src="images/lineup/kyodo.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>メイトー<br>ホームランバー<br>バニラ＆チョコ</td></tr>';
hit[11] = 1; adv[11] = '<tr><td rowspan="2"><img src="images/lineup/aut03.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>フォション<br>アイスクリームバー<br>塩キャラメル</td></tr>';
hit[12] = 1; adv[12] = '<tr><td rowspan="2"><img src="images/lineup/02.jpg" width="112" height="118"></td><td valign="top" class="normal"><br>ジャージー<br>牛乳バー</td></tr>';
hit[13] = 1; adv[13] = '<tr><td rowspan="2"><img src="images/lineup/morimilk.jpg" width="112" height="118"></td><td valign="top" class="normal"><br><br>ピノ</td></tr>';

  for(i=0; i<=hit.length - 1; i++) {
    m += hit[i];
  }
  n = Math.floor(Math.random() * m);
  n++;
  for(i=0; i<=hit.length - 1; i++) {
    x = y;
    y += hit[i];
    if(x<n && n<=y) ad = adv[i];
  }
  document.write(ad);
}