var len = images_arr.length;
var buffer = new Array(); 

for (i=0; i<len; i++) {
	buffer[i] = new Image();
	buffer[i].src = images_arr[i];
} 

var ran = Math.round(Math.random() * (len-1));


function getRandomImage () {
	document.write('<img src="'+images_arr[ran]+'" alt="Home Banner" />');
} // End function