function getParams(){
    var params = new Array();
    var addr = location.href;
    if (addr.indexOf('?')!=-1){
        addr = addr.split('?')[1].split('&');
        for (var i=0;i<addr.length;i++){
            var item = addr[i].split('=');
            if(item[0])params[item[0]]=(item[1])?item[1]:"";
        }
    }
    return params;
}

function createCookie(name,value,days){
	if (days){
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}


function readCookie(name){
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++){
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

var params = getParams();
var ref = (readCookie("ref")!=null) ? readCookie('ref') : "";
ref = (params['ref']!=undefined && params['ref']!="") ? params['ref'] : ref;

if (ref == ""){
    ref = '0';

} else if (ref != readCookie("ref")) {
    createCookie("ref",ref,30);
}