var theImages = new Array() // do not change this

//　↓連番　　　画像のURL　ﾌｧｲﾙ名　同様に画像の加減・変更可。　　　

theImages[0] = 'entrance.jpg'

theImages[1] = 'noren.jpg'

// ======================================

// do not change anything below this line

// ======================================

var j = 0

var p = theImages.length;

var preBuffer = new Array()

for (i = 0; i < p; i++){

preBuffer[i] = new Image()

preBuffer[i].src = theImages[i]

}

var whichImage = Math.round(Math.random()*(p-1));

function showImage(){

document.write('<img src="'+theImages[whichImage]+'">');

}