// JavaScript Document

var UpdateInterval = 1;
var PixelPerInterval = 5;
var scorllerInterval;
var ficus;
var upa = 1;

if (document.images)
  {
     up_arrow = new Image(20,10); 
     up_arrow.src="triangle-up-b.gif"; 
     down_arrow = new Image(20,10); 
     down_arrow.src="triangle-down-g.gif"; 
    }
	
	function start_scroll_up()
{

	if (upa == 0) 
	{	document.getElementById('downarrow').src="triangle-down-b.gif";
		upa = 1;
		}
	scorllerInterval = setInterval(scroll_up, UpdateInterval);
}

function scroll_up()
{
	document.getElementById('grand-content-text').scrollTop -= PixelPerInterval;

	if (document.getElementById('grand-content-text').scrollTop == 0)
	{document.getElementById('uparrow').src="triangle-up-g.gif"; }
	
} 

function start_scroll_down()
{
	if (upa == 1)
	{document.getElementById('uparrow').src="triangle-up-b.gif";
	 upa = 0;}
	scorllerInterval = setInterval(scroll_down, UpdateInterval);
}

function scroll_down()
{
	document.getElementById('grand-content-text').scrollTop += PixelPerInterval;
	if (document.getElementById('grand-content-text').scrollTop == ficus)
	{document.getElementById('downarrow').src="triangle-down-g.gif";}
	ficus = document.getElementById('grand-content-text').scrollTop;
}

function StopScroll()
{
	clearInterval(scorllerInterval);
}