function getHTTPRequest(){
    var objHTTP;
   if (window.XMLHttpRequest) {
        objHTTP = new XMLHttpRequest();
    } 
    else if (window.ActiveXObject) { 
        try { 
            objHTTP = new ActiveXObject("Msxml2.XMLHTTP"); 
        } 
        catch (e){ 
            try{ 
                objHTTP = new ActiveXObject("Microsoft.XMLHTTP"); 
            } 
            catch (e){} 
        } 
    } 
    return objHTTP;
}