var dist = 2; //number of pixels to move
var intcode;
var direction;
var div_name;

function scrollText()
{
	var dir = direction;
	div_obj = document.getElementById(div_name);
	if (dir == 'up')
	{
		if (div_obj.scrollTop == 0)
		{
			stopScroll();
		}else
		{
			div_obj.scrollTop = div_obj.scrollTop - dist;
		}
	}else if (dir == 'down')
	{
		if (div_obj.scrollTop >= div_obj.getHeight)
		{
			stopScroll();
		}else
		{
			div_obj.scrollTop = div_obj.scrollTop + dist;
		}
	}
}

function startScroll(dir,div)
{
	direction = dir;
	div_name = div;
	intcode=setInterval("scrollText()",10);
}

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