// movement speed
var speed = 7;
var id = "news-scrollable";
var height = 336;
var heightFromTop = 508;

function scrollNewsDown()
{
	var obj = document.getElementById(id);
	
	obj.up = false;
	obj.down = true;
	obj.fast = false;
	
	obj.interval = setInterval("scrollNewsContent()",50);
}

function scrollNewsUp()
{
	var obj = document.getElementById(id);
	
	obj.up = true;
	obj.down = false;
	obj.fast = false;
	
	obj.interval = setInterval("scrollNewsContent()",50);
}

function killScroll()
{
	var obj = document.getElementById(id);
	obj.up = false;
	obj.down = false;
	obj.fast = false;
	
	clearInterval(obj.interval);
}

function scrollNewsContent()
{			
	var obj = document.getElementById(id);

	var newTop;
	var objHeight = obj.offsetHeight;
	var top = obj.offsetTop - heightFromTop;
	var fast = (obj.fast) ? 2 : 1;
	if(obj.down)
	{		 
		newTop = (top > 0 - (objHeight - height)) ? top-(speed*fast) : top;
		obj.style.marginTop = newTop + "px";
	}	
	if(obj.up)
	{		 
		newTop = (top < 0) ? top+(speed*fast) : top;
		obj.style.marginTop = newTop + "px";
	}
}