function createHttp() {

    http_req = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
    
        http_req = new XMLHttpRequest();
        
           if (http_req.overrideMimeType) 
           {
               http_req.overrideMimeType('text/xml');
            }
    } else  if (window.ActiveXObject) { // IE
         try {
             http_req = new ActiveXObject("Msxml2.XMLHTTP");
             } catch (e) {
                try {
                    http_req = new ActiveXObject("Microsoft.XMLHTTP");
                    } catch (e) {}
               }
         }
         
    if (!http_req) {
    alert(' XMLHTTP Oluşturulamadı');
    return false;
    } else return http_req;
}