function setCookie(cookieName,cookieValue,nDays,path)
{
   var today = new Date();
   var expire = new Date();
   if (nDays==null || nDays==0) nDays=1;
   expire.setTime(today.getTime() + 3600000*24*nDays);
   document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString()
                 + ((path) ? ";path=" + path : "");
}

function changePreferedLanguage(prefLang,url)
{
   setCookie("prefer-language",prefLang,30,"/");
   window.location = url;
}