function langPath(fm_lang, to_lang) {

	//2012-01-05 DOM cross site script fixing
	var lang_length = 0;
	var lang_index = 0;
	var prefix = ""; 
	var suffix = "";	
	var newchgpath = "";

	var chgpath = document.location.href;
	
	if (!(fm_lang == "tc_chi" || fm_lang == "english" || fm_lang == "sc_chi"))
		return false;

	if (!(to_lang == "tc_chi" || to_lang == "english" || to_lang == "sc_chi"))
		return false;

	if (fm_lang == "english")
		lang_length = 7 ;
	else if (fm_lang == "tc_chi")
		lang_length = 6 ;
	else if (fm_lang == "sc_chi")
		lang_length = 6 ;
	else
		return false;
	lang_index = chgpath.lastIndexOf(fm_lang)

	prefix = chgpath.substring(0,lang_index)
	suffix = chgpath.substring(lang_index+lang_length)

	newchgpath = prefix + to_lang + suffix 
	
	return newchgpath;

}