var imagesArray=new Array(
"img/exchange_title2.gif","img/scholarship_645x195.jpg"
)
var ransuu= Math.floor(Math.random()*2)

        <!--
jmp = new Array("http://www.cieej.or.jp/exchange/volunteer-comparison.html","http://www.cieej.or.jp/toefl/ets_shop/");
img = new Array("img/exchange_title2.gif","img/tpo_cam1201.gif");

jmp[1] = "http://www.cieej.or.jp/exchange/volunteer-comparison.html";
jmp[2] = "http://www.cieej.or.jp/toefl/ets_shop/";

img[1] = "img/exchange_title2.gif";
img[2] = "img/tpo_cam1201.gif";
n = Math.floor(Math.random()*jmp.length);
document.write("<a href='"+jmp[n]+"'>");
document.write("<img src='"+img[n]+"' border='0'>");
//-->