var timer;

function doScroll(element, direction) {
	elem = document.getElementById(element);
	y = elem.scrollTop;
	if(direction=="up")
		y -= 5;
	else
		y += 5;
	elem.scrollTop = y;	
}

function startScroll(element, direction) {
	timer = setInterval('doScroll("'+element+'","'+direction+'")', 40);
}

function stopScroll() {
	  clearInterval(timer);
	
}