a = new Array(12);

pfad = "http://" + window.location.hostname + "/";

for (var i = 1; i <= 12; i++) {
	a[i] = new Image(); 
	a[i].src = pfad + "image/layout/rand_image/winter/hau_" + i + ".jpg";
}

function rand_image () {
	var rand_no = Math.random();
	var rand = Math.round( (a.length -2 ) * rand_no) + 1;

	if (window.name == "") {
		window.name = rand; 
	}
	else {
		if (window.name == rand) {
			rand_no = Math.random();
			rand = Math.round( (a.length -2 ) * rand_no) + 1;
			window.name == rand;
		}
	}

	document.getElementById('rand_image').style.backgroundImage = "url(" + a[rand].src + ")";
	
	//alert (a[rand].src);
	//alert (document.getElementById('rand_image').style.backgroundImage);
}

window.onload = rand_image;