function ajaxReq(url, tag) {
    var http_request = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType)
        { http_request.overrideMimeType('text/xml'); }

    } 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('Cannot create an XMLHTTP instance');
        return false;
    }
    http_request.onreadystatechange = function() {
        if (http_request.readyState == 4) {
            if (http_request.status == 200) {
                IgotIt = http_request.responseText
                if (tag == undefined) {
                    done = eval(IgotIt) //no tag , run as js
                } else if (IgotIt.length > 0) {
                    IgotItA = IgotIt.split('<!--splitJavaScript-->')
                    tagA = tag.split(',')
                    IgotItArr = IgotItA[0].split('<!--splitContent-->')
                    for (i = 0; i < tagA.length; i++) {
                        if (i >= IgotItArr.length) { break; }
                        if (document.getElementById(tagA[i])) { document.getElementById(tagA[i]).innerHTML = IgotItArr[i] };
                    }
                    if (IgotItA.length > 1) { done = eval(IgotItA[1]) }
                }
            } else {
                alert('http_request.status=' + http_request.status + ';url=' + url);
            }
        }
    };
    http_request.open('GET', url, true);
    http_request.send(null);
}