var n = Math.floor(Math.random() * 40);

if(n > 3) {
	img_path = "/product/bizstream/img/page-title-idx_000.jpg";
	img_width = "629";
	img_height = "88";
} else {
	img_path = "/blog/inastream/img/banner" + n + ".gif";
	img_width = "728";
	img_height = "90";
}

document.write('<a href="/product/bizstream/?utm_source=ias&amp;utm_medium=blog&amp;utm_campaign=blog_ias" title="オンデマンドかつリアルタイムにビジネスドキュメントを生成する帳票ソリューション"><img src="' + img_path + '" alt="biz-Stream"');
document.write('width="' + img_width + '" height="' + img_height + '" /></a>');