function AJAXRequest(surl, ssendmethod, spoststring, sdisplayelement){
    this.url=surl;
    this.sendmethod=ssendmethod;
    this.poststring=spoststring;
    this.displayelement=sdisplayelement;
    this.req=0;
    this.callback = null;
    this.sourceelement = null;
    
    var self = this;
    this.go = function(){
         if (window.XMLHttpRequest) {
            this.req = new XMLHttpRequest();
        }
        else if (window.ActiveXObject) {
            this.req = new ActiveXObject("Microsoft.XMLHTTP");
        }
        //alert(this.req.readystate);
        this.req.onreadystatechange = function(){processajax(self);};
        //req.displayelement = this.displayelement;
        this.req.open(this.sendmethod, this.url, true);
        if (this.sendmethod=='POST')this.req.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
        this.req.send(this.poststring);
        
    }

    var processajax = function (j){

        var req = j.req;
        if (req.readyState == 4) {
            if (req.status == 200) {
             if (j.displayelement!=null)j.displayelement.innerHTML=req.responseText;
             if (j.callback!=null) j.callback(j.sourceelement, req);
            }
        }
    }
}

var show=true;
var xs = new Array();
function postajax(url,sendmethod,poststring, displayelement){
	
    var u = url;
    var req;
    dispelement = document.getElementById(displayelement);
    var x = new AJAXRequest(url, sendmethod, poststring, dispelement);
    x.go();
}

function postcallback(url, sendmethod, poststring,  callback, sourceelement){
    var x = new AJAXRequest(url, sendmethod, poststring, null);
    x.callback = callback;
    x.sourceelement = sourceelement;
    x.go();
}
function getPostString(postname){
    var b = document.getElementById(postname).value;
    return postname + "=" + escape(b);
}

function getFormString(formid){
    var b="";
    for (i=0;i<formid.elements.length;i++){
        b+=formid.elements[i].id + "=" + escape(formid.elements[i].value) + "&";
    }
    return b;
}

function findParentAjax(el){
    while((el.tagName != "DIV" || el.className!="ajax") && el.parentNode!=null){
        //alert(el.className+ " "+el.id);
        el = el.parentNode;
    }
    return el;
}
function refreshElement(url, sendmethod, poststring, elementid){
    var a = findParentAjax(elementid);
    postajax(url,sendmethod,poststring,a.id);
}