tag=new Array();
tag[0]='<img src="images/topmain_photo_1.jpg" width="355" height="440" alt="ハピネスさんあい" />';
tag[1]='<img src="images/topmain_photo_2.jpg" width="355" height="440" alt="ハピネスさんあい" />';
tag[2]='<img src="images/topmain_photo_3.jpg" width="355" height="440" alt="ハピネスさんあい" />';
i=Math.floor(Math.random()*tag.length);
document.write(tag[i]);