how to play back ground music when page loads in ASP.Net

<script type="text/javascript">
        var soundObject = null;
        function PlaySound() {
            if (soundObject != null) {
                document.body.removeChild(soundObject);
                soundObject.removed = true;
                soundObject = null;
            }
            soundObject = document.createElement("embed");
            soundObject.setAttribute("src", "sounds/sound.wav");
            soundObject.setAttribute("hidden", true);
            soundObject.setAttribute("autostart", true);
            document.body.appendChild(soundObject);

        } 
window.onload = PlaySound; 
    </script>