var count=0;
var isuse=0;
var t1=400000;
var t2=100000;
function x1() {
	document.getElementById('u1').style.display='block';
	document.getElementById('u2').style.display='none';
	document.getElementById('d1').style.display='block';
	document.getElementById('d2').style.display='none';
}
function x2() {
	document.getElementById('u1').style.display='none';
	document.getElementById('u2').style.display='block';
	document.getElementById('d1').style.display='none';
	document.getElementById('d2').style.display='block';
}
function divalt() {
 	//isuse=0
	switch (count) {
		case 0:
			x1();
			break;
		case 1:
			x2();
			break;
	}
	count++;
	if(count > 2)
		count=0;
	clk0=setTimeout('divalt()',t1); 
}

function restart(c) {
	
	isuse=0;
	divalt();
}
function stop(c) {
	count=c-1;
	if(typeof(clk0)!='undefined')
		clearTimeout(clk0);
	if(isuse) {
		clearTimeout(clk1);
		isuse=0;
	}
	switch (c) {
		case 1:
			x1();
			break;
		case 2:
			x2();
			break;
	}
	isuse=1;//clk is using now
	clk1=setTimeout('restart()',t2);
}

if (window.addEventListener)
window.addEventListener("load", divalt, false)
else if (window.attachEvent)
window.attachEvent("onload", divalt)