var image_array = new Array()

image_array[0] = 'images/1.png'
image_array[1] = 'images/2.png'
image_array[2] = 'images/3.png'

var j = 0
var p = image_array.length;
var pre_buffer = new Array()
for (i = 0; i < p; i++){
   pre_buffer[i] = new Image()
   pre_buffer[i].src = image_array[i]
}
var rand_int = Math.round(Math.random()*(p-1));

function rand_image(){
	
	document.write('<img src="'+image_array[rand_int]+'"alt="Main Logo"/>');

}