var s, t, w=2078, c=0, u=50;
function init()
{
	s = document.getElementById('sample');
	s.style.backgroundPosition = '0px 0px';
	t = setInterval('bg_move()', u);
}
function show_object(o)
{
	var detail = '';
	for(x in o) detail += x + ' -> ' + o[x] + '<br />';
	document.body.innerHTML += detail;
}
function bg_move()
{
	c = c == w ? 1 : c+1;
	s.style.backgroundPosition = c + 'px 0px';
}
function speedDown()
{
	if(u == 100) return;
	clearInterval(t);
	u = u+10;
	t = setInterval('bg_move()', u);
	document.getElementById('sm').innerHTML = u;
}
function speedUp()
{
	if(u == 10) return;
	clearInterval(t);
	u = u-10;
	t = setInterval('bg_move()', u);
	document.getElementById('sm').innerHTML = u;
}