url= new Array();

url[0]  = "umitabibito/index.html";
url[1]  = "umitabibito/index.html";
url[2]  = "umitabibito/index.html";

banner= new Array();

banner[0]  = "images/umi1.jpg";
banner[1]  = "images/umi2.jpg";
banner[2]  = "images/umi3.jpg";

max_banner=banner.length;
i_num = Math.floor(Math.random() * max_banner);
document.write("<A href='"+url[i_num]+"' TARGET='_blank'><img src='"+banner[i_num]+"' BORDER=0></A>&nbsp;&nbsp;&nbsp;&nbsp;");