var defaultStyle = "style2009";
var currentStyle;
var cookies = lireCookie("style");

var bgStyle = ((cookies == "style2009") || (cookies == "grd")) ? cookies : defaultStyle;

setActiveStyleSheet(bgStyle);
//------------------------------------
//fonction creation cookie
//------------------------------------
function creerCookie(name,value,days) {
 if (days) {
  var date = new Date();
  date.setTime(date.getTime()+(days*24*60*60*1000));
  var expires = "; expires="+date.toGMTString();
 }
  else expires = "";
  document.cookie = name + "=" + value + expires + "; path=/";
 }

//------------------------------------
//fonction lecture cookie
//------------------------------------
function lireCookie(name) {
 var nameEQ = name + "=";
 var ca = document.cookie.split(';');
 for(var i=0;i < ca.length;i++) {
  var c = ca[i];
  while (c.charAt(0)==' ') c = c.substring(1,c.length);
  if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
 }
 return null;
 }
 
 function setActiveStyleSheet(title) {
 var i, a, main;
 currentStyle = title; 
 var date = new Date();
 creerCookie("style",currentStyle,date.getTime());
 for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
  if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
  a.disabled = true;
  if(a.getAttribute("title") == title) a.disabled = false;
  }
 }
}