function changeLanguage(lang){
    if (location.href.indexOf('language=en') > -1)
        location.href = location.href.replace('language=en', 'language=' + lang);
    else if (location.href.indexOf('language=it') > -1) 
        location.href = location.href.replace('language=it', 'language=' + lang);
    else{
        if (location.href.indexOf("?") > -1)
            location.href = location.href + '&language=' + lang;
        else
            location.href = location.href + '?language=' + lang;
    }
        
}