var refererKey = 'RefererUrlKey';
var signupHomePage = "http://baoming.xueyuan.chinaedu.net:8081/web/index.jsp";
var local_url_keys = [];


local_url_keys[local_url_keys.length] = '121.52.219.121';


function isLocalURL(url) {
	var result = false;
	if (url != null || url != '') {
		if (url.indexOf(location.host) >= 0) {
			result = true;
		}
		else {
			for(var i = 0; i < local_url_keys.length; i ++) {
				if (url.indexOf(local_url_keys[i]) == 0) {
					result = true;
					break;
				}
			}
		}
	}
	return result;
}

function getReferrer() {
	var ref = document.referrer;
	if (ref == null) ref = '';
	if (ref.length == 0) {
		try {
			if (opener.location.href.length > 0) ref = opener.location.href;
		} catch(e) {ref = ''} 
	}
	return ref;
}

var refer = getReferrer();
if (refer != '' && !isLocalURL(refer)) {
	setCookie(refererKey, refer);
}

function getCurrentReferrer() {
	return getCookie(refererKey);
}

function redirectSignupHomePage() {
	var referer = getCurrentReferrer();
	setCookie(refererKey, '');
	location.href = signupHomePage + '?resourceURL=' + escape(referer);
}

function setCookie(key, value) {
	if (value == '')
		document.cookie = key + '=' + escape(value) + '; expires=' + new Date().toGMTString(); 
	else
		document.cookie = key + '=' + escape(value) + ';';
}

function getCookie(key) {
	var result = '';
	var str = document.cookie;
	if (str != null && str != '') {
		var values = str.split(';');
		for(var i = 0; i < values.length; i ++) {
			var kn = key + '=';
			var idx = values[i].indexOf(kn);
			if (idx >= 0) {
				result = unescape(values[i].substring(kn.length + idx));
				break;
			}
		}
	}
	return result;
}