(function () {
    'use strict';
    var grayscalestyle = '<style>' +
        'html{' +
        '  -webkit-filter: grayscale(100%);' +
        '  -moz-filter: grayscale(100%)!important;' +
        '  -ms-filter: grayscale(100%);' +
        '  -o-filter: grayscale(100%)!important;' +
        '  filter: grayscale(100%);' +
        '  filter: progid:dximagetransform.microsoft.basicimage(grayscale = 1) \\9;' +
        '  filter: gray !important;' +
        '}' +
        '</style >';

    var grayscaleconfig = window.power_grayscale_config;
    var startdatetime = new date(grayscaleconfig.startdatetime);
    var enddatetime = new date(grayscaleconfig.enddatetime);
    var nowdate = new date();
    if (grayscaleconfig.enabled &
        nowdate.gettime() >= startdatetime.gettime() &
        nowdate.gettime() <= enddatetime.gettime()) {
        var navstr = navigator.useragent.tolowercase();
        if (navstr.indexof("msie 10.0") == -1 || navstr.indexof("rv:11.0") == -1) {
            $("head").append(grayscalestyle);
        }
    }
}())