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

var pop = null;

function popdown() {
  if (pop && !pop.closed) pop.close();
}

function openFenster(url,w,h) {
  if (!url) return true;
  w = (w) ? w += 20 : 630;  // 630px*300px is the default size
  h = (h) ? h += 25 : 300;
  var args = 'width='+w+',height='+h+',resizable';
  popdown();
  pop = window.open(url,'',args);
  pop.focus();
  return (pop) ? false : true;
}

window.onunload = popdown;
window.onfocus = popdown;


var header_img = document.createElement('img');


function setRealHeader(next) {
	var header_img = YAHOO.util.Dom.get('header_img');
	var anim_out = new YAHOO.util.Anim(header_img, {opacity: {to:0}}, 0.5, YAHOO.util.Easing.easeIn);
	var anim_in = new YAHOO.util.Anim(header_img, {opacity: {to:1}}, 1, YAHOO.util.Easing.easeOut);
	anim_out.onComplete.subscribe(function() {
		setTimeout(function() {header_img.src = next;}, 0);
//		anim_in.animate();
		YAHOO.util.Event.onContentReady(header_img, anim_in.animate());
	});
	anim_out.animate();
}