function GetXmlHttpObject(){
	var xmlHttp=false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
        xmlHttp = new XMLHttpRequest();
        if (xmlHttp.overrideMimeType) {
            xmlHttp.overrideMimeType('text/xml');
        }
	} else if (window.ActiveXObject) { // IE
        try {
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }
    if (!xmlHttp) {
        alert('Error : Cannot create an XMLHTTP instance');
        return false;
    }
	return xmlHttp;
}