var txt = new Array();
txt[0]="<a class='noblank' href='http://www.secom.co.jp/' target='_blank'><img src='http://www.kinder.co.jp/img/secom.jpg' alt='PR'></a>";
txt[1]="<a class='noblank' href='http://www.wakuwaku-village.com/' target='_blank'><img src='http://www.kinder.co.jp/img/wakuwaku.jpg' alt='PR'/></a>";


mmax = 2; //メッセージ行数
txtno = Math.floor(Math.random() * mmax);
document.write(txt[txtno]);