// Set up the image files to be used.
var theImages = new Array() // do not change this
// To add more image files, continue with the
// pattern below, adding to the array. Rememeber
// to increment the theImages[x] index!

theImages[0] = 'IMG_2058.JPG'
theImages[1] = 'IMG_2327.JPG'
theImages[2] = 'IMG_2347.JPG'
theImages[3] = 'IMG_2390.JPG'
theImages[4] = 'IMG_2417.JPG'
theImages[5] = 'IMG_3930.JPG'
theImages[6] = 'IMG_3761.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]+'">');
}

http://www.jsCode.com/

Random Image Script

JavaScript