jmp = new Array();
img = new Array();
jmp[0] = "http://www.itrust.co.jp/seminar/detail/index.php?smid=223";
jmp[1] = "http://www.itrust.co.jp/seminar/detail/index.php?smid=223";

img[0] = "http://www.radionikkei.jp/archives/banner/1260237362.gif";
img[1] = "http://www.radionikkei.jp/archives/banner/1262735082.gif";

n = Math.floor(Math.random()*jmp.length);
document.write("<a href='"+jmp[n]+"'>");
document.write("<img src='"+img[n]+"' border='0'>");
document.write("</a>");