function XmlHttp_Initialize(xmlhttp_req) {
    try {
        req=new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e) {
        try {
        	req=new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch(oc) {
		req=null;
        }
    }

    if(!req&&typeof XMLHttpRequest!="undefined") {
	req= new XMLHttpRequest();
        }
    return req;
}