img = new Array();
alt = new Array();
link = new Array();

img[0] = "img/super_osusume1e.jpg";
img[1] = "img/super_osusume2e.jpg";
img[2] = "img/super_osusume3e.jpg";
img[3] = "img/super_osusume4e.jpg";

alt[0] = "osusume";
alt[1] = "osusume";
alt[2] = "osusume";
alt[3] = "osusume";

link[0] = "http://www.muromoto.co.jp/english/contents/search/detail.php/nile/PSH10/";
link[1] = "http://www.muromoto.co.jp/english/contents/search/detail.php/merry/VST25/";
link[2] = "http://www.muromoto.co.jp/english/contents/search/detail.php/nile/AF5A/";
link[3] = "http://www.muromoto.co.jp/english/contents/search/detail.php/merry/1050H/";

n = Math.floor(Math.random()*img.length);

document.write("<a href='" +link[n]+"'>");
document.write("<img src='"+img[n]+"' border='0' alt='"+alt[n]+"'>");
document.write("</a>");