function prelo(bild) {
    var pre_image = new Image();
    pre_image.src = bild;
}

//var bilder = new Array("/sitemedia/img/bg_header1.jpg",
//					   "/sitemedia/img/bg_header2.jpg",
//					   "/sitemedia/img/bg_header3.jpg");
var bilder = new Array("/sitemedia/header/header_01.jpg",
		   "/sitemedia/header/header_02.jpg",
		   "/sitemedia/header/header_03.jpg");

for(i=0;i<bilder.length;i++)
	prelo(bilder[i]);

//prelo("/sitemedia/heart.gif");
//prelo("/sitemedia/heart_hover.gif");
	
var header_img = document.createElement('img');

function start() {
//	var first = getRandom(-1);
	var first = getRandom(0);
	YAHOO.util.Dom.setStyle('noscriptheaderimg', 'display', 'none');
	var header_div = document.getElementById('header');
	header_img.src = bilder[first];
//	YAHOO.util.Dom.setStyle(header_img, 'opacity', '0'); // so we can fade it in later
	header_div.appendChild(header_img);
	
//	var anim_in = new YAHOO.util.Anim(header_img, {opacity: {to:1}}, 3, YAHOO.util.Easing.easeIn);
//	setTimeout(function() { anim_in.animate(); }, 2000);
	setTimeout(function() { setHeader(first); }, 5000);
}
function setHeader(prev) {
	var next = getRandom(prev);
	var anim_out = new YAHOO.util.Anim(header_img, {opacity: {to:0}}, 3, YAHOO.util.Easing.easeIn);
	anim_out.onComplete.subscribe(function() {
		header_img.src = bilder[next];
		(new YAHOO.util.Anim(header_img, {opacity: {to:1}}, 3, YAHOO.util.Easing.easeOut)).animate();
	});
	anim_out.animate();
	setTimeout(function() { setHeader(next); }, 16000);
	
};
function getRandom(prevNum) {
	var number = prevNum;
	while( number == prevNum ) {
		number = Math.random() * bilder.length;
		number = Math.floor(number);
	}
	return number;
};