// JavaScript Document
var img1 = new Image();
var img2 = new Image();
var img3 = new Image();
var img4 = new Image();
var img5 = new Image();
var img6 = new Image();
img1.src = "photo/top_1.jpg";
img2.src = "photo/top_2.jpg";
img3.src = "photo/top_3.jpg";
img4.src = "photo/top_4.jpg";
img5.src = "photo/top_5.jpg";
img6.src = "photo/top_6.jpg";

iValue = Math.random() * 6;
rNumber = Math.ceil(iValue);
if(rNumber==0) rNumber++;
document.write("<img src=" + eval("img" + rNumber + ".src") + " alt=\"写真：工場での作業風景\" />");