jmp = new Array();
img = new Array();

jmp[0] = "http://www.campusnavi.com/pg/high-speed/";
jmp[1] = "http://www.soptalk.jp/";
jmp[2] = "http://c.p-advg.com/adpCnt/r?mid=823557&lid=1";

img[0] = "ad_casio.gif";
img[1] = "ad_soptalk.gif";
img[2] = "468-60-web.jpg";


n = Math.floor(Math.random()*jmp.length);
document.write("<a href='"+jmp[n]+"' class=\"blank\">");
document.write("<img src='/img/ad/"+img[n]+"' id=\"banner\">");
document.write("</a>");