var xmlhttp = false;
        
// If the user is using Mozilla/Firefox/Safari/etc
if (window.XMLHttpRequest) {
        //Intiate the object
        xmlhttp = new XMLHttpRequest();
        //Set the mime type
        xmlhttp.overrideMimeType('text/xml');
} else if (window.ActiveXObject) {
        //Intiate the object
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}