window.onload = function() {
    if (document.getElementById('construction-photos')) {
        var arPhotos = [
            'construction-photo-001.jpg',
            'construction-photo-002.jpg',
            'construction-photo-003.jpg',
            'construction-photo-004.jpg',
            'construction-photo-005.jpg',
            'construction-photo-006.jpg'
        ];
        var iRandomNumber1 = Math.floor(Math.random() * arPhotos.length);
        var iRandomNumber2 = Math.floor(Math.random() * 50000);
        document.getElementById('construction-photos').src = 'images/photos/' + arPhotos[iRandomNumber1] + '?' + iRandomNumber2;
    }
}