var UpdateInterval = 60;
var PixelPerInterval = 10;
var scorllerInterval;

function start_scroll_left()
{
	scorllerInterval = setInterval(scroll_left, UpdateInterval);
}

function scroll_left()
{
	document.getElementById('scroller').scrollLeft -= PixelPerInterval;
} 

function start_scroll_right()
{
	scorllerInterval = setInterval(scroll_right, UpdateInterval);
}

function scroll_right()
{
	document.getElementById('scroller').scrollLeft += PixelPerInterval;
}

function stop_scrolling()
{
	clearInterval(scorllerInterval);
}