var cb=1, cbmax=12;
	var timerbg;

function changeBackground () {
//	cb=cb+1;
	cb=Math.floor(Math.random()*(cbmax+1));
	if (cb>cbmax) {cb=1;}
	if (cb<1) {cb=1};
	newbg="url(images/home/B_R"+cb+".jpg) top left no-repeat";
	document.getElementById('bgimage').style.background=newbg;
	var randomtime=Math.floor(Math.random()*5);
	randomtime=randomtime;
	timerbg=setTimeout("changeBackground()",randomtime*1000);
}