function AJAXmakeRequest(url, data, returnFunc, returnParams) {
        var http_request = false;

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/plain');
                // See note below about this line
            }
        } else if (window.ActiveXObject) { // IE            
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
//            alert('Váš prehliadač nepodporuje dynamické čítanie dát');
            return false;
        }
        http_request.onreadystatechange = function() { returnFunc(http_request, returnParams); };
        http_request.open('POST', url, true);
        http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        http_request.send(data);
        return true;
    }

    function AJAXmakeRequestGet(url, returnFunc, returnParams) {

        var http_request = false;

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/plain');
                // See note below about this line
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
//            alert('Váš prehliadač nepodporuje dynamické čítanie dát');
            return false;
        }
        http_request.onreadystatechange = function() { returnFunc(http_request, returnParams); };        
        http_request.open('GET', url, true);
        http_request.send(null);
        return true;
    }