var cookie_validity = 3;

function SetCookie (name, value)
{
   var argv = SetCookie.arguments;
   var argc = SetCookie.arguments.length;
   var expires = (argc > 2) ? argv[2] : null;
   var path = (argc > 3) ? argv[3] : null;
   var domain = (argc > 4) ? argv[4] : null;
   var secure = (argc > 5) ? argv[5] : false;
   document.cookie = name + "=" + escape (value) + ((expires == null) ? "": ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : (";path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");
}
function getCookieVal (offset)
{
   var endstr = document.cookie.indexOf (";", offset);
   if (endstr == -1)
	endstr = document.cookie.length;

   return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie (name)
{
   var arg  = name + "=";
   var alen = arg.length;
   var clen = document.cookie.length;

   var i = 0;
   while (i < clen) {
	var j = i + alen;
	if (document.cookie.substring(i, j) == arg) 	return getCookieVal (j);
	i = document.cookie.indexOf(" ", i) + 1;
	if (i == 0)	break;
   } 
   return '';
}

function registerCookie(name,validity,value){
date=new Date;
//validite du cookie en mois
date.setMonth(date.getMonth() + validity);
//le cookie est accessible depuis toutes les pages du portail
SetCookie(name,value,date, "/");
}