//<![CDATA[
function getXMLHttp(){
    var xmlHttp;
        if (window.XMLHttpRequest) { 
            xmlHttp = new XMLHttpRequest();
            if (xmlHttp.overrideMimeType) {
                xmlHttp.overrideMimeType("text/xml");
            }
        } else if (window.ActiveXObject) {
            try {
                xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                 try {
                  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
                 } catch (e) {}
            }
        }
        return xmlHttp;
    }
//]]>