// JavaScript Document
var imgMax = 2;
var imgRandom = Math.floor(Math.random() * imgMax);

if(imgRandom == 0) document.write('<img src="http://www.chochin.jp/img/top-ber.jpg" width="565" height="70">');
else if(imgRandom == 1) document.write('<img src="http://www.chochin.jp/img/top-ber_02.jpg" width="565" height="70">');