<!DOCTYPE html>
<html>
<head>
    <title>gpdods.com</title>
    <style>
        body, html {
            height: 100%;
            margin: 0;
            padding: 0;
        }
        .bg {
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            width: 100%;
            z-index: -1;
        }
    </style>
</head>
<body>
    <div class="bg" id="bg1" style="background: url('images/image1.jpg'); background-size: cover;"></div>
    <div class="bg" id="bg2" style="background: url('images/image2.jpg'); background-size: cover; display: none;"></div>
    <div class="bg" id="bg3" style="background: url('images/image3.jpg'); background-size: cover; display: none;"></div>
    <div class="bg" id="bg4" style="background: url('images/image4.jpg'); background-size: cover; display: none;"></div>

    <script>
        let bgArray = [document.getElementById("bg1"), document.getElementById("bg2"), document.getElementById("bg3"), document.getElementById("bg4")];
        let i = 0;
        setInterval(function() {
            bgArray[i % 4].style.display = "none";
            bgArray[(++i) % 4].style.display = "block";
        }, 5000);  // Change image every 5 seconds
    </script>
</body>
</html>