function CreateRequest () {
    var HttpRequest = false;
    try {
             if (window.XMLHttpRequest) { HttpRequest = new XMLHttpRequest (); }
        else if (window.ActiveXObject)  { return new ActiveXObject ("Microsoft.XMLHTTP"); }
        
    } catch (HttpRequestFailed)
    { HttpRequest = false; }

    if (!HttpRequest)
         { alert ("Przykro mi ale ta strona nie moze zostac poprawnie wyswietlona."); }
    else { return HttpRequest; }
}
function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    } else{
        ro = new XMLHttpRequest();
    }
    return ro;
}
var http = createRequestObject();