var old=0;

function init(){
	show(0);
}

function show(x){
	document.getElementById("topbild").innerHTML = "<img src='" + bilder[x] + "' width=940 height=273 alt='' border='0'>";
}

function next(){
	old++;
	if(old>=bilder.length){old=0;}
	show(old);
}

function prev(){
	old--;
	if(old<0){old=bilder.length-1;}
	show(old);
}