function createRequestObject() {
    var obj;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        obj = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        obj = new XMLHttpRequest();
    }
    return obj;
}

var http = createRequestObject();

function getNextMessage() {
    http.open('get', 'fetch.php?n='+(Math.floor(Math.random()*99999)+9999));
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
    if(http.readyState == 4){
        var response = http.responseText;
        document.getElementById('spoken_words').innerHTML = '“' + response + '”';
    }
}