function init_ajax(){
    if (window.XMLHttpRequest) {
        try {
            return new XMLHttpRequest();
        } catch (e){}
    } else if (window.ActiveXObject) {
        try {
            return new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e){
          try {
              return new ActiveXObject('Microsoft.XMLHTTP');
          } catch (e){}
        }
    }
    return null;
}

function loadDoc(link, id){
  req=init_ajax();

  if (req){
     req.onreadystatechange = function () {
        // Статус 4 означает успешное выполнение
        if (req.readyState == 4) {

          if (req.status == 200) {
             var response = req.responseText;
             document.getElementById(id).innerHTML = response;
          } else {
            alert('Невозможно получить данные с сервера: ' + req.statusText);
          }
        }
     }

     if(/\?/.test(link))
      link = link  + '&' + Math.random();
     else
      link = link  + '?' + Math.random();


     req.open("GET", link, true);
     req.send(null);
  }
}

function loadDocAsync(link){

  //req=init_ajax();
  var req;
  if (window.XMLHttpRequest){
     req = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
     // Если нет, то работаем с ИЕ, где все не как у людей
     req = new ActiveXObject("Microsoft.XMLHTTP");
  }

	if (req){

	req.onreadystatechange = function () {
        // Статус 4 означает успешное выполнение
        if (req.readyState == 4) {

          if (req.status != 200) {
            alert('Невозможно получить данные с сервера: ' + req.statusText);
          }
        }
     }

     if(/\?/.test(link))
      link = link  + '&' + Math.random();
     else
      link = link  + '?' + Math.random();


     req.open("GET", link, false);
     req.send(null);
		 return req.responseText;

  }
}

 var plus_ico='/icon/plusx.gif';
 var minus_ico='/icon/minusx.gif';
 function switch_element(tree_id,element_name){
		if(document.getElementById('include_'+element_name+'_'+tree_id).style.display=='none'){
			document.getElementById('include_'+element_name+'_'+tree_id).style.display='';
			document.getElementById('ico_'+element_name+'_'+tree_id).src=minus_ico;
		}
		else{
			document.getElementById('include_'+element_name+'_'+tree_id).style.display='none';
			document.getElementById('ico_'+element_name+'_'+tree_id).src=plus_ico;
		}
 }
 
 function loadd(al,id){
 	//al = encodeURIComponent(al);
 	loadDoc(al,id);
 	//return false;
 }
 
/***********************************************
* Ajax Page Fetcher- by JavaScript Kit (www.javascriptkit.com)
***********************************************/

var ajaxpagefetcher={
loadingmessage: "Loading Page, please wait...",
exfilesadded: "",

connect:function(containerid, pageurl, bustcache, jsfiles, cssfiles){
	var page_request = false
	var bustcacheparameter=""
	if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc
		page_request = new XMLHttpRequest()
	else if (window.ActiveXObject){ // if IE6 or below
		try {
		page_request = new ActiveXObject("Msxml2.XMLHTTP")
		} 
		catch (e){
			try{
			page_request = new ActiveXObject("Microsoft.XMLHTTP")
			}
			catch (e){}
		}
	}
	else
		return false
	var ajaxfriendlyurl=pageurl.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/") 
	page_request.onreadystatechange=function(){ajaxpagefetcher.loadpage(page_request, containerid, pageurl, jsfiles, cssfiles)}
	if (bustcache) //if bust caching of external page
		bustcacheparameter=(ajaxfriendlyurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
	//document.getElementById(containerid).innerHTML=ajaxpagefetcher.loadingmessage //Display "fetching page message"
	page_request.open('GET', ajaxfriendlyurl+bustcacheparameter, true)
	page_request.send(null)
},

loadpage:function(page_request, containerid, pageurl, jsfiles, cssfiles){
	if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
		document.getElementById(containerid).innerHTML=page_request.responseText
		for (var i=0; i<jsfiles.length; i++)
			this.loadjscssfile(jsfiles[i], "js")
		for (var i=0; i<cssfiles.length; i++)
			this.loadjscssfile(cssfiles[i], "css")
		this.pageloadaction(pageurl) //invoke custom "onpageload" event
	}
},

createjscssfile:function(filename, filetype){
	if (filetype=="js"){ //if filename is a external JavaScript file
		var fileref=document.createElement('script')
		fileref.setAttribute("type","text/javascript")
		fileref.setAttribute("src", filename)
	}
	else if (filetype=="css"){ //if filename is an external CSS file
		var fileref=document.createElement("link")
		fileref.setAttribute("rel", "stylesheet")
		fileref.setAttribute("type", "text/css")
		fileref.setAttribute("href", filename)
	}
	return fileref
},

loadjscssfile:function(filename, filetype){ //load or replace (if already exists) external .js and .css files
	if (this.exfilesadded.indexOf("["+filename+"]")==-1){ //if desired file to load hasnt already been loaded
		var newelement=this.createjscssfile(filename, filetype)
		document.getElementsByTagName("head")[0].appendChild(newelement)
		this.exfilesadded+="["+filename+"]" //remember this file as being added
	}
	else{ //if file has been loaded already (replace/ refresh it)
 	var targetelement=(filetype=="js")? "script" : (filetype=="css")? "link" : "none" //determine element type to create nodelist using
 	var targetattr=(filetype=="js")? "src" : (filetype=="css")? "href" : "none" //determine corresponding attribute to test for
 	var allsuspects=document.getElementsByTagName(targetelement)
 	for (var i=allsuspects.length; i>=0; i--){ //search backwards within nodelist for matching elements to remove
  	if (allsuspects[i] && allsuspects[i].getAttribute(targetattr)!=null && allsuspects[i].getAttribute(targetattr).indexOf(filename)!=-1){
   	var newelement=this.createjscssfile(filename, filetype)
   	allsuspects[i].parentNode.replaceChild(newelement, allsuspects[i])
  	}
		}
 }
},


pageloadaction:function(pageurl){
	this.onpageload(pageurl) //call customize onpageload() function when an ajax page is fetched/ loaded
},

onpageload:function(pageurl){
 //do nothing by default
},

load:function(containerid, pageurl, bustcache, jsfiles, cssfiles){
	var jsfiles=(typeof jsfiles=="undefined" || jsfiles=="")? [] : jsfiles
	var cssfiles=(typeof cssfiles=="undefined" || cssfiles=="")? [] : cssfiles
	this.connect(containerid, pageurl, bustcache, jsfiles, cssfiles)
}

} //End object

//Sample usage:
//1) ajaxpagefetcher.load("mydiv", "content.htm", true)
//2) ajaxpagefetcher.load("mydiv2", "content.htm", true, ["external.js"])
//3) ajaxpagefetcher.load("mydiv2", "content.htm", true, ["external.js"], ["external.css"])
//4) ajaxpagefetcher.load("mydiv2", "content.htm", true, ["external.js", "external2.js"])
//5) ajaxpagefetcher.load("mydiv2", "content.htm", true, "", ["external.css", "external2.css"])