jQuery(document).ready(function() {
    var t = new Date(),
        h = t.getHours(),
        m = t.getMinutes(),
        background = document.getElementById("ipbwrapper");
    if (h >= 22 || h >= 0 && h < 6) {
        if (m >= 30) {
            background.className += "night";
        } else {
            background.className += "night1";
        }
    } else if (h >= 6 && h < 9) {
        if (m >= 30) {
            background.className += "dawn";
        } else {
            background.className += "dawn1";
        }
    } else if (h >= 9 && h < 20) {
        if (m >= 30) {
            background.className += "day";
        } else {
            background.className += "day1";
        }
    } else {
        if (m >= 40) {
            background.className += "dusk";
        } else if (m >= 20) {
            background.className += "dusk1";
        } else {
            background.className += "dusk2";
        }
    }
});