var c = 0;
var nb2;	  
var timer;

function menu(nb)
{
 var a = 360 / nb;		
 nb2 = nb;
 var posX;
 var posY;
 var rayon = 180;
 var centreX = document.getElementById("centreMenu").offsetLeft;
 var centreY = document.getElementById("centreMenu").offsetTop;
 var lItem = 60;
 var i = 1;
 var item;
 var b;
 
for(b = 0; b < 360; b += a)
 {		  
  posX = centreX + 600 - rayon * Math.cos(b * Math.PI / 180);
  posY = centreY + 250 + rayon * Math.sin(b * Math.PI / 180); 
  item = document.getElementById("item" + i);
  item.className = "item";	
  item.style.left = (posX - lItem / 2) + "px";
  item.style.top = (posY - lItem / 2) + "px"; 
  i++;
 }
}

function anim()
{		  
 c++;
 var a = 360 / nb2;		
 var posX;
 var posY;
 var rayon = 180;
 var centreX = document.getElementById("centreMenu").offsetLeft;
 var centreY = document.getElementById("centreMenu").offsetTop;
 var lCentre = 500;
 var lItem = 60;
 var i = 1;
 var item;
 var b;

 for(b = 0; b < 360; b = b + a)
 {		  
  posX = centreX + 600 - rayon * Math.cos((b + c) * Math.PI / 180);
  posY = centreY + 250 + rayon * Math.sin((b + c) * Math.PI / 180); 
  
  item = document.getElementById("item" + i);
  item.style.left = (posX - lItem / 2) + "px";
  item.style.top = (posY - lItem / 2) + "px"; 
  i++;
 }	
}

timer = setInterval("anim()",50);

function stopanim()
{
 clearInterval(timer);		   
}

function replayanim()
{
 timer = setInterval("anim()",50);
}