var scrollInterval=null;
function scrollContent(target,amount){
	var tdiv=document.getElementById(target);
	if(amount>0){
		if((tdiv.clientHeight+tdiv.scrollTop)>=tdiv.scrollHeight) return false;
		tdiv.scrollTop+=amount;
		if((tdiv.clientHeight+tdiv.scrollTop)>tdiv.scrollHeight) tdiv.scrollTop=tdiv.scrollHeight-tdiv.clientHeight;
	}
	if(amount<0){
		if(tdiv.scrollTop==0) return false;
		tdiv.scrollTop+=amount;
		if(tdiv.scrollTop<0) tdiv.scrollTop=0;
	}
	return false;
}

function startScroll(target,amount){
	scrollInterval=window.setInterval("scrollContent('"+target+"',"+amount+")",50);
}

function stopScroll(){
	window.clearInterval(scrollInterval);
}