function movedown()
	{
	if (window.moveupvar) 
		clearTimeout(moveupvar);

	if (iens6 && parseInt(crossobj.style.top) >= (contentheight * (-1) + 300))
		crossobj.style.top = parseInt(crossobj.style.top) - speed + "px";
	else if (ns4 && crossobj.top >= (contentheight * (-1) + 300))
		crossobj.top -= speed;

	movedownvar = setTimeout("movedown()", 20);
	}

function moveup()
	{
	if (window.movedownvar) 
		clearTimeout(movedownvar);
	
	if (iens6 && parseInt(crossobj.style.top) <= 0)
		crossobj.style.top = parseInt(crossobj.style.top) + speed + "px";
	else if (ns4 && crossobj.top <= 0);
		crossobj.top += speed;

	moveupvar = setTimeout("moveup()", 20);
	}

function stopscroll()
	{
	if (window.moveupvar) 
		clearTimeout(moveupvar);

	if (window.movedownvar) 
		clearTimeout(movedownvar);
	}

function movetop()
	{
	stopscroll();

	if (iens6)
		crossobj.style.top = 0 + "px";
	else if (ns4)
		crossobj.top = 0;
	}

function getcontent_height()
	{
	if (iens6)
		contentheight = crossobj.offsetHeight;
	else if (ns4)
		document.nscontainer.document.nscontent.visibility = "show";
		
	// Set the active button.
	setbutton();
	}