function setLang(lang){
if (lang=="en" || lang=="es") {
url="";
url +=document.location;
pos = url.indexOf("lang=");
	if (pos == -1){
		if (location.search.length > 0){
			url = url.substring(0,url.indexOf("?")) + "?lang="+lang;
		}
		else{
			url +="?lang="+lang;
		}
	}
	else{
	url = url.substring(0,pos) + "lang="+lang;
	}
document.location=url;
}
}