function print_banner() {
	banner_info = new Array();

	display_max = 3; // 表示するバナー数
	banner_dir = "banner"; // バナーのディレクトリ

	// バナーの情報を格納する（ハッシュの配列）
	banner_info[0] = new Array();
	banner_info[0]["img"] = "witz.gif";
	banner_info[0]["url"] = "http://www.witz-inc.co.jp";
	banner_info[0]["valid"] = "T";
	
	banner_info[1] = new Array();
	banner_info[1]["img"] = "aic.gif";
	banner_info[1]["url"] = "http://www.aicp.co.jp";
	banner_info[1]["valid"] = "T";
	
	banner_info[2] = new Array();
	banner_info[2]["img"] = "acc.gif";
	banner_info[2]["url"] = "http://www.aisin-comcruise.com";
	banner_info[2]["valid"] = "T";

	// print banners
	
	document.write("<table width=\"480\" cellpadding=\"9\" cellspacing=\"0\" border=\"0\" align=\"center\">");
	document.write("<tr>");

	for (i = 0; i < display_max; i++) {
		
		n = Math.floor(Math.random()*banner_info.length);

		while (banner_info[n]["valid"] != "T") {
			n = Math.floor(Math.random()*banner_info.length);
		}
		
		document.write("<td>");
		document.write("<a class=\"none\" href=\""+banner_info[n]["url"]+"\" onClick=\"javascript: pageTracker._trackPageview(\'/"+banner_dir+"/"+banner_info[n]["img"]+"\');\">");
		document.write("<img class=\"logo\" src=\""+banner_dir+"/"+banner_info[n]["img"]+"\" width=\"120\" height=\"55\" alt=\"banner\">");
		document.write("</a>");
		document.write("</td>");

		banner_info[n]["valid"] = "F";
	}

	document.write("</tr>");
	document.write("</table>");
}