var timerID=null;
var amount=3;
var interval = 50;

function ScrollDown(id)
{
	var item = document.getElementById(id);
	if (item)
		item.scrollTop += amount;
		
	clearTimeout(timerID);
	timerID = setTimeout("ScrollDown('" + id + "')", interval);
}

function ScrollUp(id)
{
	var item = document.getElementById(id);
	if (item)
		item.scrollTop -= amount;
		
	clearTimeout(timerID);
	timerID = setTimeout("ScrollUp('" + id + "')", interval);		
}

function applyscrollup(imageid, id)
{
	var image = document.getElementById(imageid);
	if (image)
	{
		image.onmouseover = function()
		{
			ScrollUp(id);
		}
	
		image.onmouseout = function()
		{
			clearTimeout(timerID);
			timerID = null;
		}		
	}
}

function applyscrolldown(imageid, id)
{
	var image = document.getElementById(imageid);
	if (image)
	{
		image.onmouseover = function()
		{
			ScrollDown(id);
		}
	
		image.onmouseout = function()
		{
			clearTimeout(timerID);
			timerID = 0;
		}		
	}
}