When loading an xml document, it does not work in Chrome

function readxml(filename) {
    xmlHttp = new window.xmlHttpRequest();
    xmlHttp.open("GET", filename, false)
    xmlHttp.send(null)
    xmlDoc = xmlHttp.responseXML.documentElement
}


function loadXMLDoc(dname) 

{
    try //Internet Explorer

    {
        xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
    }

    catch(e)

    {
        try //Firefox, Mozilla, Opera, etc.

        {
            xmlDoc=document.implementation.createDocument("","",null);
        }

        catch(e) {alert(e.message)}
    }

    try 
    {
        xmlDoc.async=false;
        xmlDoc.load(dname);
        return(xmlDoc);
    }
    catch(e) {alert(e.message)}
    return(null);
}