var decalage = 0;
var nbBout;	  
var timer;
function menu(nb)
{
 var angle = 360 / nb;		
 nbBout = nb;
 var posX;
 var posY;
 var rayon = 60;
 var centreX = document.getElementById("centre").offsetLeft;
 var centreY = document.getElementById("centre").offsetTop;
 var lItem = 20;
 var i = 1;
 var item;
 var b;
 
for(b = 0; b < 360; b += angle)
 {		  
  posX = centreX + 25 + rayon * Math.cos(b * Math.PI / 180);
  posY = centreY + 25 + rayon * Math.sin(b * Math.PI / 180); 
  
  item = document.getElementById("item" + i);
  item.className = "item";	
  item.style.top = (posY - lItem / 2) + "px"; 
  item.style.left = (posX - lItem / 2) + "px";
  i++;
 }
}
posX = centreX + 25 + rayon * Math.cos(b * Math.PI / 180);
posY = centreY + 25 + rayon * Math.sin(b * Math.PI / 180);