var px = 5;//scrollspeed
var timer;

function initializeScrolling(){
d=document.getElementById('scrolldiv');
	if(d.scrollHeight > d.offsetHeight){
		document.getElementById('scrollpfeil-up').style.visibility = 'visible';
		document.getElementById('scrollpfeil-down').style.visibility = 'visible';
	}
}

function scrollDenDiv(val){
	clearTimeout(timer);
	y=d.scrollTop;
	if(val==1)y-=px;
	if(val==2)y+=px;
	if(y<=d.scrollHeight-d.offsetHeight+px&&y>=0-px){
		d.scrollTop=y;
		timer=setTimeout('scrollDenDiv('+val+')',50);
	}
	if(y<0||y>d.scrollHeight-d.offsetHeight){
		clearTimeout(timer);
	}
}