/* create a random number to chose image */
var rand1 = Math.floor(Math.random()*8)+1;

/* create an array of images to utilise the rand outcome */
imageChoice = new Array(8);

imageChoice[1] = "image1.jpg";
imageChoice[2] = "image2.jpg";
imageChoice[3] = "image3.jpg";
imageChoice[4] = "image4.jpg";
imageChoice[5] = "image5.jpg";
imageChoice[6] = "image6.jpg";
imageChoice[7] = "image7.jpg";
imageChoice[8] = "image8.jpg";

/* write the images to the page */
function writeImage() {
	var oObj = document.getElementById("random_image");
	
	oObj.style.backgroundImage = "url('http://www.premiumplacements.com.au/RandomImages/" + imageChoice[rand1] +"')";
	oObj.style.backgroundRepeat = "no-repeat";
	oObj.style.backgroundPosition = "top left";
}