function changeLanguage(tolang) {
    var loc = document.location.href;
	var host = document.location.host;
	var path = document.location.pathname;
	var protocol = document.location.protocol;	
    if ( loc.lastIndexOf("/en/") != -1 ){
        tloc =  loc.replace("/en/", "/"+tolang+"/");
    } else if ( loc.lastIndexOf("/tc/") != -1 ){
        tloc =  loc.replace("/tc/", "/"+tolang+"/");
    } else if ( loc.lastIndexOf("/gb/") != -1 ){
        tloc =  loc.replace("/gb/", "/"+tolang+"/");
    } else {
		tloc = protocol+"//"+host+"/"+tolang+path;		
	}

    window.location = tloc;
}