function NachOben() {
 var y=0;
 if (window.pageYOffset) y = window.pageYOffset;
 else if (document.body && document.body.scrollTop) y=document.body.scrollTop;
 while(y > 0) {
      setTimeout("window.scrollBy(0,-10)",2);
      y = y - 2;
 }
}

function hide(neu){
	var pop=eval(document.getElementById(neu));
	pop.style.visibility="hidden";
}
function show(neu){
	var pop=document.getElementById(neu);
	pop.style.visibility="visible";
}
function onoff(neu){
	var pop=document.getElementById(neu);

	if(pop.style.visibility!="visible"){
		pop.style.visibility="visible";
	}else{
		pop.style.visibility="hidden";
	}
}