function rollover(Bildname, Dateiname) {
   if (document.images) {document.images[Bildname].src = Dateiname }
}
function popup(url,width, height) { 
	fenster=window.open(url, "Popupfenster", "width="+width+",height="+height+",resizable=yes"); 
	fenster.focus(); 
	return false; 
}

function mainnavi () {
	var nav_items = document.getElementById('navigation').getElementsByTagName('li');

	for (i=0; i < nav_items.length; i++) {
		if(nav_items[i].className!='sel'){
			nav_items[i].onmouseover = function(){
				this.className = 'sel';			
			}
			nav_items[i].onmouseout = function(){
				this.className = '';
			}
		}
	}
}

function show_subnavi(el){
	if(el.lastChild.nodeName=='DIV'){
		el.getElementsByTagName('div')[0].style.display = 'block';				
	}
}

function hide_subnavi(el){
	if(el.lastChild.nodeName=='DIV'){
		el.getElementsByTagName('div')[0].style.display = 'none';				
	}
}