nested checking background

img_berita.src = '/img/{{ $home->berita_background }}';
    img_berita.onload = function() {
        agenda_position_y = berita_position_y + (((screen.width / this.width) * this.height) - gap);
        img_agenda.src = '/img/{{ $home->agenda_background }}';
        img_agenda.onload = function() {
            sejarah_position_y = agenda_position_y + (((screen.width / this.width) * this.height) - gap);
            img_sejarah.src = '/img/{{ $home->sejarah_background }}';
            img_sejarah.onload = function() {
                tentang_position_y = sejarah_position_y + (((screen.width / this.width) * this.height) - gap);
                img_tentang.src = '/img/{{ $home->tentangkami_background }}';
                img_tentang.onload = function() {
                    berita_position_y2 = tentang_position_y + (((screen.width / this.width) * this.height) - gap);
                    img_berita2.src = '/img/{{ $home->berita_background }}';
                    img_berita2.onload = function() {
                        agenda_position_y2 = berita_position_y2 + (((screen.width / this.width) * this.height) - gap);
                        img_agenda2.src = '/img/{{ $home->agenda_background }}';
                        img_agenda2.onload = function() {
                            sejarah_position_y2 = agenda_position_y2 + (((screen.width / this.width) * this.height) - gap);
                            img_sejarah2.src = '/img/{{ $home->sejarah_background }}';
                            img_sejarah2.onload = function() {
                                tentang_position_y2 = sejarah_position_y2 + (((screen.width / this.width) * this.height) - gap);
                                img_tentang2.src = '/img/{{ $home->tentangkami_background }}';
                                img_tentang2.onload = function() {
                                    $('#konten').css({
                                        'background-image': 'url("' + img_berita.src + '"), url("' + img_agenda.src + '"), url("' + img_sejarah.src + '"), url("' + img_tentang.src + '"), url("' + img_berita2.src + '"), url("' + img_agenda2.src + '"), url("' + img_sejarah2.src + '"), url("' + img_tentang2.src + '")',
                                        'background-position-x': '0px, 0px, 0px, 0px',
                                        'background-position-y': berita_position_y + 'px, ' + agenda_position_y + 'px, ' + sejarah_position_y + 'px, ' + tentang_position_y + 'px, ' + berita_position_y2 + 'px, ' + agenda_position_y2 + 'px, ' + sejarah_position_y2 + 'px, ' + tentang_position_y2 + 'px',
                                        'background-repeat': 'no-repeat, no-repeat, no-repeat, no-repeat, no-repeat, no-repeat, no-repeat, no-repeat',
                                        'background-size': 'contain, contain, contain, contain, contain, contain, contain, contain'
                                    });
                                };
                            };
                        };
                    };
                };
            };
        };
    };