var milliseconds = 4000;
var i=1;                          
var int;
var old=-1;
function rotate(spec){
	if(spec!=null){
		i=spec;
		control(0);
	};
	if(old!=-1)
	{
		document.getElementById(old).style.display = 'none';
		document.getElementById("rotate"+old).style.textDecoration = 'none';
	}
	else
	{
		document.getElementById(1).style.display = 'none';
		document.getElementById("rotate1").style.textDecoration = 'none';
	}
	document.getElementById(i).style.display = 'block';
	document.getElementById("rotate"+i).style.textDecoration = 'underline';
	old=i;
	i++;
	if(i>3){
		i=1;
		control(0);
	}
};
function control(op){
	if(!op){
		document.getElementById('stop').style.display = 'none';
		document.getElementById('play').style.display = 'inline';
		clearInterval(int);
	}
	else{
		document.getElementById('stop').style.display = 'inline';
		document.getElementById('play').style.display = 'none';
		int = setInterval('rotate()', milliseconds);
	};
};
window.onload=function(){
	int = setInterval('rotate()', milliseconds);     
};