var images = new Array();
images[0] = 'home_header_img_01.png';
images[1] = 'home_header_img_03.png';

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


var internal_images = new Array();
internal_images[0] = 'internal_01.jpg';

function internal_showImage(){
	var j = 0;
	var p = internal_images.length;
	var preBuffer = new Array();
	for (i = 0; i < p; i++){
	   preBuffer[i] = new Image();
	   preBuffer[i].src = internal_images[i];
	}
	var whichImage = Math.round(Math.random()*(p-1));
	document.getElementById('internalImage').src='images/'+internal_images[whichImage];
}