var sprung = 5; //Wieviel Pixel gescrolltwerden soll
var speed = 20; //WIederholgeschindigkeit


function startRight() {
scroller = setInterval("doscroll('right')",speed);
}

function startLeft() { 
scroller = setInterval("doscroll('left')",speed);
}
function stop(){
clearInterval(scroller);
}


function doscroll(move){
scrollDiv = document.getElementById('fenster2');
nowpad = parseInt(scrollDiv.style.marginLeft);
if(move == "right"){
dopad = nowpad - sprung;
width = parseInt(scrollDiv.style.width)
sight = width + nowpad

windowDiv = document.getElementById('fenster');
wdiv_wid = parseInt(windowDiv.style.width);

if(sight <= wdiv_wid){
stop();
return ;
}
}else{
dopad = nowpad + sprung;
if(nowpad == 0){
stop();
return ;
}
}
scrollDiv.style.marginLeft = dopad+"px";
return ;
}