function createXMLHttpRequest() {
    if (window.ActiveXObject) {
        return new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if (window.XMLHttpRequest) {
        return new XMLHttpRequest;
    }
}
var xmlHTTP
var fLoaded = false;


function gup(name) {
    name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
    var regexS = "[\\?&]" + name + "=([^&#]*)";
    var regex = new RegExp(regexS);
    var results = regex.exec(window.location.href);
    if (results == null) return "";
    else return results[1];
	return "";
}
var param = gup('p');

function button_click(spage) {
    if (typeof(spage) == "object" ) spage = 'home';
    xmlHTTP = createXMLHttpRequest();
    if (xmlHTTP) {

        if (fLoaded == false && param != "") {
            spage = param;
            fLoaded = true;
        }

        xmlHTTP.open('GET', 'content.ashx?p=' + spage, true)
        xmlHTTP.onreadystatechange = doUpdate;
        xmlHTTP.send(null);
    }
}

function doUpdate() {
    if (xmlHTTP.readyState == 4) {
        var sResponse = xmlHTTP.responseText;
        var oDiv = document.getElementById("a2")
        oDiv.innerHTML = sResponse;
        if (oDiv.style.display = "none") oDiv.style.display = "block";
        oDiv.scrollTop = 0;
        return;
    }
}