Need help calling array to post in Html

I am trying to get my array to read from a xml file and post into html.(My assignment is to get ajax to run from xml) My script so far is

    <script type="text/javascript">
    var xmlDoc;
    var xmlhttp;



    function loadinfo()
        {
            xmlhttp = new XMLHttpRequest();
            xmlhttp.onreadystatechange = readinfo;
            xmlhttp.open("GET", "Info.xml", true);
            xmlhttp.send();


        }


    function readinfo()
        {
        if (xmlhttp.readyState == 4) {
            xmlDoc = xmlhttp.informationXML;

            var items = xmlDoc.getElementsByTagName("info")



            var var1 = items[0].getAttribute("campus-email", "campus-phone", "online-email", "online-phone");

        }
    }

I made sure I added this to the body > body onload="loadinfo();"