function setLang(l) {
// Called from links which switch the language.
// Sets cookie with "lang=fr" or other language code, valid for 1 year, on all the site
var expire = new Date();
expire.setTime(expire.getTime() + 3600000*24*365);
document.cookie = 'idioma='+l+";expires="+expire.toGMTString()+";path=/";
}