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

img[0] = "http://www.redbaron.co.jp/banner/head_banner.gif";
url[0] = "http://www.redbaron.co.jp/license/index.html?utm_source=sbana&utm_medium=license&utm_campaign=roll1";
alt[0] = "";

img[1] = "http://www.redbaron.co.jp/banner/direct_sbanner.gif";
url[1] = "http://www.redbaron.co.jp/sell/direct.html?utm_source=sbana&utm_medium=sell&utm_campaign=roll1";
alt[1] = "";

img[2] = "http://www.redbaron.co.jp/banner/300ten_super.gif";
url[2] = "http://www.redbaron.co.jp/press/entrys/01/11150.html?utm_source=sbana&utm_medium=300c&utm_campaign=roll1";
alt[2] = "";

img[3] = "http://www.redbaron.co.jp/banner/hyosung_super.jpg";
url[3] = "http://www.redbaron.co.jp/press/entrys/01/3564.html";
alt[3] = "hyosung";

function setBanner(){
	amount = img.length;
	if(amount != 0){
		No = Math.floor(Math.random()*amount);
		document.write('<div class="head-banner"><div><a target="_blank" href="'+url[No]+'"><img alt="'+alt[No]+'" src="'+img[No]+'" border="0" /></a></div></div>');
	}
}
setBanner();