The JS

    function getHTML(pageName, elementID) {
        if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp = new XMLHttpRequest();
        } else {// code for IE6, IE5
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange = function() {
            if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                document.getElementById(elementID).innerHTML = xmlhttp.responseText;
            }
        };
        xmlhttp.open("GET", pageName, true);
        xmlhttp.send();
        return xmlhttp;
    }

function changeContent1() {
getHTML("index.html","Be Mine Remix");
}