function clang(lang) {
fpath=parent.window.location+""
if (lang==null){
	if (fpath.indexOf("/b5/")!=-1) {fpath=fpath.replace(/\/b5\//,"/en/")}
	   else {fpath=fpath.replace(/\/en\//,"/b5/")}
	parent.window.location.href=fpath}
else	{
	if (fpath.indexOf("/en/")!=-1){searchstring="/en/"}
	if (fpath.indexOf("/b5/")!=-1){searchstring="/b5/"}
	if (fpath.indexOf("/gb/")!=-1){searchstring="/gb/"}
	replacestring="/"+lang+"/"
	fpath=fpath.replace(searchstring,replacestring)
	parent.window.location.href=fpath}
}