function seturl(lang){
 if (document.location.href.indexOf('lang='+lang)!=-1) return;
 pos=document.location.href.indexOf('lang=');
 if (pos!=-1) {
	newURL=document.location.href.substr(0, pos);
 	document.location = newURL + 'lang=' + lang;
 	return;
 }
 if (document.location.href.indexOf("?")==-1){
 	document.location=document.location.href+'?lang=' + lang;
 } else {
  	document.location=document.location.href+'&lang=' + lang;
 }
}