function ajaxInstance()
{
    var ajax = false;
    /*@cc_on @*/
    /*@if (@_jscript_version >= 5)
        try {
            ajax = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e) {
            try {
                ajax = new ActiveXObject('Microsoft.XMLHTTP');
            } catch (E) {
                ajax = false;
            }
        }
    @end @*/
    if (!ajax && typeof XMLHttpRequest != 'undefined') {
        ajax = new XMLHttpRequest();
    }
    return ajax;
}
function ajaxReplace(element, url)
{
    var ajax = ajaxInstance();
    if (!ajax) {
        return false;
    }
    ajax.open('GET', url, true);
    ajax.onreadystatechange = function() {
if(ajax.readyState == 4) {
            element.innerHTML = ajax.responseText;
        }
    }
    ajax.send(null);
    return true;
}