function switchLanguage(lang) {
    tmp = document.location.href;
    dest = "Lingua="+lang;
	if (tmp.indexOf("Lingua=")>0)
	{
	tmp=tmp.replace("Lingua=I", dest);
    tmp=tmp.replace("Lingua=D", dest);
    tmp=tmp.replace("Lingua=GB", dest);
	}
	else
	{
	if (tmp.indexOf("?")>0)
	{tmp=tmp+"&" + dest;}
	else
	{tmp=tmp+"?" + dest;}
	}
    document.location.href = tmp
}