function ajaxrequest() {
    var page_request = false
    if (window.XMLHttpRequest) // if Mozilla, Safari etc
        page_request = new XMLHttpRequest()
    else if (window.ActiveXObject) { // if IE
        try {
            page_request = new ActiveXObject("Msxml2.XMLHTTP")
        }
        catch (e) {
            try {
                page_request = new ActiveXObject("Microsoft.XMLHTTP")
            }
            catch (e) { }
        }
    }
    return page_request
}

function ajaxpage_return(url) {
    var page_request = ajaxrequest()
    if (!page_request) return false
    /* if (bustcachevar) //if bust caching of external page
    bustcacheparameter = (url.indexOf("?") != -1) ? "&" + new Date().getTime() : "?" + new Date().getTime()*/
    page_request.open('GET', url, false);   //url + bustcacheparameter
    page_request.send(null);
    var aRes = page_request.responseText;
    if(aRes.indexOf("ERR") == 0) {
        alert(aRes);
        return null
    } else
        return aRes
}

/*
jQuery.fn.center = function () {
    this.css("position", "absolute");
    this.css("top", ($(window).height() - this.height()) / 2 + $(window).scrollTop() + "px");
    this.css("left", ($(window).width() - this.width()) / 2 + $(window).scrollLeft() + "px");
    return this;
}

jQuery.fn.centerTop = function () {
    this.css("position", "absolute");
    this.css("top", ($(window).height() - this.height()) / 2 + $(window).scrollTop() + "px");
    return this;
}
*/