if (window.attachEvent)
    window.attachEvent("onload", setupPlaySound);
else
    window.addEventListener("load", setupPlaySound, false);

function setupPlaySound() {
    if (navigator.appName == "Microsoft Internet Explorer") {
        var snd = document.createElement("bgsound");
        document.getElementsByTagName("body")[0].appendChild(snd);

        playSound = function(url) {
            snd.src = url;
        }
    }
    else {
        playSound = function(url) {
            var obj = document.createElement("object");
            obj.width = "0";
            obj.height = "0";
            obj.type = "audio/x-wav";
            obj.data = url;

            var body = document.getElementsByTagName("body")[0];
            body.appendChild(obj);
        }
    }
}