ads = new Array(1);
links = new Array(1);

ads[0] = "點連結在博客來購書，用您的心意回饋創作工廠";
links[0] = "http://www.books.com.tw/exep/assp.php/xire/";

ads[1] = "在博客來購書，不僅常有打折，而且取書很方便";
links[1] = "http://www.books.com.tw/exep/assp.php/xire/";

ads[2] = "創作的養分來自知識，用讀書餵養創意";
links[2] = "http://www.books.com.tw/exep/assp.php/xire/";

ads[3] = "填問卷累積點數換現金";
links[3] = "http://www.ixpanel.com/member_add.jsp?cf=WppY06&ml=Y&mld=xirefu";

index = Math.floor(Math.random() * ads.length);
document.write("<div><a href=" + links[index] + " target=_blank>" + ads[index] + "</a></div>");