<script>
    var f =document.getElementById("first");
    var s  =document.getElementById("second");



    if(localStorage.getItem('myFlag') == null || localStorage.getItem('myFlag') == 0) {
        f.style.display = '';
        s.style.display = 'none';
        localStorage.setItem('myFlag', 1);
    } else {
        f.style.display = 'none';
        s.style.display = '';
        localStorage.setItem('myFlag', 0);
    }

</script>