var speed = 8;
var time;
function scroll(val) {
	clearTimeout(time);
	d = document.getElementById('content');
	y = d.scrollTop;
	if(val == 1) {
		y -= speed;
	}
	if(val == 2) {
		y += speed;
	}
	if(y <= d.scrollHeight - d.offsetHeight + speed && y >= 0 - speed) {
		d.scrollTop = y;
		time = setTimeout('scroll('+val+')',50);
	}
	if(y < 0 || y > d.scrollHeight - d.offsetHeight) {
		clearTimeout(time);
	}
}