var imglist = new Array(
	"../img/random/0.jpg",
	"../img/random/1.jpg",
	"../img/random/2.jpg",
	"../img/random/3.jpg",
	"../img/random/4.jpg",
	"../img/random/5.jpg",
	"../img/random/6.jpg",
	"../img/random/7.jpg",
	"../img/random/8.jpg",
	"../img/random/9.jpg" );
var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
var output = "<img src=" + imglist[selectnum] + " alt=\"富岡製糸場と絹産業遺産群 イメージ\" />";