document.open();

var urlPath = "http://c-blackbox.sakura.ne.jp/BlackBox/Circle/";
var urlPath2 = "http://www.toranoana.jp/mailorder/article/";
var urlPath4 = "http://www.w-canvas.com/products/";

// ランダムに画像を表示する
jmp = new Array();
img = new Array();
// ジャンプ先のアドレス(数字は画像と対応)
jmp[0] = "" + urlPath4 + "detail.php?product_id=27482";
jmp[1] = "" + urlPath2 + "04/0020/02/83/040020028310.html";
jmp[2] = "" + urlPath2 + "04/0030/01/05/040030010586.html";
jmp[3] = "" + urlPath2 + "04/0030/01/49/040030014912.html";
// 画像のアドレス(数字はジャンプ先のアドレスと対応)
img[0] = "" + urlPath + "img/top05.jpg";
img[1] = "" + urlPath + "img/top06.jpg";
img[2] = "" + urlPath + "img/top07.jpg";
img[3] = "" + urlPath + "img/top08.jpg";
n = Math.floor(Math.random()*jmp.length);
document.write("<a href='"+jmp[n]+"' TARGET='_blank'>");
document.write("<img src='"+img[n]+"' border='0'>");
document.write("</a><BR>");

document.close();