loading xml string?

How do I get IXMLDomElement or IXMLDomDocument from a given xml string in Jquery, currently this I am getting by

    var xmlNode = ActiveXObject("Msxml2.DOMDocument.3.0");
    xmlNode.loadXML(xmlStr);
    var ixmlDomElement = xmlNode.documentElement;

I want to remove dependency on ActiveXObject by using Jquery so that it works uniformly on all browser.