function LoadImage(obj){
	var images=new Array();
	images[0]=["../img/sfondo/sfondo01.jpg"];
	images[1]=["../img/sfondo/sfondo02.jpg"];

	// Following code generates a random number
	var now = new Date();
	var ry = now.getSeconds() % images.length;
	newImage = images[ry][0];
    obj.style.backgroundImage = "url(" + newImage + ")";	
}