var imageBank = new Array()

imageBank[0] = 'images/imgbar-resources.jpg'
imageBank[1] = 'images/window-washer.jpg'
imageBank[2] = 'images/imgbar_banner1.jpg'
imageBank[3] = 'images/imgbar_banner2.jpg'
imageBank[4] = 'images/imgbar_banner3.jpg'
imageBank[5] = 'images/imgbar_banner4.jpg'
imageBank[6] = 'images/imgbar_banner5.jpg'
imageBank[7] = 'images/imgbar_banner6.jpg'

var j = 0
var p = imageBank.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = imageBank[i]
}
var imageSelect = Math.round(Math.random()*(p-1));
function swapPic(){
document.write('<img src="'+imageBank[imageSelect]+'">');
}