var theImages = new Array()

theImages[0] = 'warrock4.gif'
theImages[1] = 'knight4.gif'
theImages[2] = 'redstone4.gif'
theImages[3] = 'silk4.gif'
theImages[4] = 'warcraft4.gif'
theImages[5] = 'metin24.gif'

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="images/'+theImages[whichImage]+'">');
}