// refresh.html

(function(){

function getRefreshLevel() {
    var search = window.location.search || '?level=0';
    var request = /\??level=(.*)\b/g.exec(search);
    
    if(request && request.length) {
        
        return request[1];
    }
    return null;
}

var refreshlevel = parseInt(getRefreshLevel());

if(!isNaN(refreshlevel) && refreshlevel < 4) {
    setTimeout(function() {
        var dd = 'refresh.html?level=' + (++refreshlevel);
        window.location.href = dd;//'refresh.html?refresh=' + (++refreshlevel);
    }, 3000);
}

// test
if(refreshlevel > 0)
    alert('fresh ' + refreshlevel + ' times.');

})();