var histImages = new Array()
//add or remove history images here ------->
histImages[0] = '/images/index_img/rotating/history_1.jpg'
histImages[1] = '/images/index_img/rotating/history_2.jpg'
histImages[2] = '/images/index_img/rotating/history_3.jpg'
histImages[3] = '/images/index_img/rotating/history_4.jpg'
// ----------------------------------------->
var j = 0
var p = histImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = histImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showHistImage(){
document.write('<img src="'+histImages[whichImage]+'">');
}


var artImages = new Array()
//add or remove art images here ------->
artImages[0] = '/images/index_img/rotating/art_1.jpg'
artImages[1] = '/images/index_img/rotating/art_2.jpg'
artImages[2] = '/images/index_img/rotating/art_3.jpg'
artImages[3] = '/images/index_img/rotating/art_4.jpg'
// ----------------------------------------->
var j = 0
var p = artImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = artImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showArtImage(){
document.write('<img src="'+artImages[whichImage]+'">');
}

var scienceImages = new Array()
//add or remove science images here ------->
scienceImages[0] = '/images/index_img/rotating/science_1.jpg'
scienceImages[1] = '/images/index_img/rotating/science_2.jpg'
scienceImages[2] = '/images/index_img/rotating/science_3.jpg'
//----------------------------------------->
var j = 0
var p = scienceImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = scienceImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showScienceImage(){
document.write('<img src="'+scienceImages[whichImage]+'">');
}