Untitled

Run JQuery function just once per visit
$('#startup').delay(1500).fadeOut(2000);

var now = (new Date()).getTime();
var lastTime = 0;
var lastTimeStr = localStorage['lastTime'];
if (lastTimeStr) lastTime = parseInt(lastTimeStr, 10);
if (now - lastTime > 24*60*60*1000) {
     // do animation
}
localStorage['lastTime'] = ""+now;

/* Here are some utility localStorage functions */
    function store_data(data, key) {
        if (!window.localStorage || !window.JSON) {
            return;
        }
        key = key || data_key;
        localStorage.setItem(key, JSON.stringify(data));
    }

    function get_data(key) {
        if (!window.localStorage || !window.JSON) {
            return;
        }
        key = key || data_key;
        var item = localStorage.getItem(key);

        if (!item) {
            return;
        }

        return JSON.parse( item );
    }

    function remove_data(key) {
        if (!window.localStorage || !window.JSON) {
            return;
        }
        key = key || data_key;
        localStorage.removeItem(key);
    }
   /* and the check */
   var now = (new Date()).getTime(),
       then = parseInt(get_data('last_visit'), 10) || 0,
       diff = now - then;
    if( diff > 24*60*60*1000 ) {
       $('#startup').delay(1500).fadeOut(2000);
       store_data('last_visit', (new Date()).getTime());
    }