function switchLang(lang) {



var pageHref = location.href;

pageHref = pageHref.substr(7,pageHref.length-7);



		if (lang == 'chi') {

			charOffSet = pageHref.lastIndexOf("/eng/");

			pagePath = pageHref.substr(0,charOffSet+1);

			str1 = pageHref.substring( pageHref.indexOf('/eng/')+5, pageHref.length );

			document.location.href = "http://" + pagePath + "chi/" + str1;

		}

		else {

			charOffSet2 = pageHref.lastIndexOf("/chi/");

			pagePath2 = pageHref.substr(0,charOffSet2+1);

			str2 = pageHref.substring( pageHref.indexOf('/chi/')+5, pageHref.length );

			//Followings are to handle with No English version page
			if (str2.substring(0,4) == "rock" || str2.substring(0,3) == "Geo" || str2.substring(0,22) == "projects/index1_1.html" || str2.substring(0,7) == "ecology" || str2.substring(0,6) == "nature" || str2.substring(0,14) == "photography/pw" || str2.substring(0,17) == "photography/skill" || str2.substring(0,8) == "ringtone" || pageHref.substring(1,4) == "IUCN") {
				
				document.location.href = "http://" + pagePath2 + "index_e.html";
			}
			else  {

				document.location.href = "http://" + pagePath2 + "eng/" + str2;
			}
			
			
		}

}