var sign = new Array();
sign[0] = "banner/a01.jpg";
sign[1] = "banner/a02.jpg";
sign[2] = "banner/a03.jpg";
sign[3] = "banner/a04.jpg";
sign[4] = "banner/a05.jpg";
sign[5] = "banner/a06.jpg";
sign[6] = "banner/a07.jpg";
sign[7] = "banner/a08.jpg";
sign[8] = "banner/a09.jpg";
sign[9] = "banner/a10.jpg";
sign[10] = "banner/a11.jpg";
sign[11] = "banner/a12.jpg";
sign[12] = "banner/a13.jpg";
sign[13] = "banner/a14.jpg";


var show = sign[Math.round((sign.length - 1) * Math.random())];
document.write('<img src="' + show + '" border="0">');