//class AjaxChain
GLOBAL_CHAIN_STACK       = new Array; // массив цепей
var GLOBAL_CHAIN_COUNTER = 0;   // c самого начала цепей вообще нету.

//===================================================================================
//
//===================================================================================
function AjaxChain()
{
 this.chain_number = GLOBAL_CHAIN_COUNTER;
 GLOBAL_CHAIN_COUNTER++;

 try {
 GLOBAL_CHAIN_STACK[this.chain_number]   =  false;  
 if  (window.XMLHttpRequest)  
   GLOBAL_CHAIN_STACK[this.chain_number] =  new  XMLHttpRequest();  
 else  if  (window.ActiveXObject)  
   GLOBAL_CHAIN_STACK[this.chain_number] =  new  ActiveXObject("Microsoft.XMLHTTP");  
}
catch(e) {alert("ERROR IN AjaxChain CONSTRUCTOR (XMLHttpRequestObj was not created) " +  e);}

this.stack         = new Array; // стек возвращаемых getAjax значений. (на самом деле это не стеки, а очереди) !
this.string_stack  = new Array; // стек передаваемых на сервер строк.
this.func_stack    = new Array; // стек функций обработчиков.
this.arg_stack     = new Array; // стек аргументов ф-ий обработчиков.
                             

//this.getAjax  = AjaxChain__getAjax;  // сразу на страницу
this.getAjax = AjaxChain__getAjax;  // только в переменную
}


function AjaxChain__getAjax(string,func_handler)
{
 var tosR = this.stack.length;
 var chain_number = this.chain_number;
 
 var arg = new Array;
 var i; 

  for(i=2;i<arguments.length;i++)
   arg[i-2] = arguments[i]; 

 if(tosR!=0 && this.stack[tosR-1] == 'wait')
 {
  this.string_stack.push(string);
  this.func_stack.push(func_handler);
  this.arg_stack.push(arg);
 }
 else
 {
		this.stack[tosR] = 'wait';
		if(GLOBAL_CHAIN_STACK[chain_number])  
		{  
			GLOBAL_CHAIN_STACK[chain_number].open("GET", string);
			var self = this;
			GLOBAL_CHAIN_STACK[chain_number].onreadystatechange  =  function()  
			{  
				if  (GLOBAL_CHAIN_STACK[chain_number].readyState  ==  4  &&  GLOBAL_CHAIN_STACK[chain_number].status  ==  200)  
				{
					self.stack[tosR]  =  GLOBAL_CHAIN_STACK[chain_number].responseText; // Получить данные с сервера
					//alert(self.stack[tosR]);
					if(tosR!=0)
					 func_handler(self.stack[tosR],arg[0]);                           // вызвать ф-ю обработчик.
					else
					 func_handler(self.stack[tosR],arg);                              // вызвать ф-ю обработчик.
					  
					if(self.string_stack.length!=0)
					 self.getAjax(self.string_stack.shift(),self.func_stack.shift(),self.arg_stack.shift());
					else
					 self.stack = new Array;
					
				}  
				else {}
					//this.stack[tosR]  = 'wait';
			}  
			GLOBAL_CHAIN_STACK[chain_number].send(null);  
		} 
		else
		 alert( "GLOBAL_CHAIN_STACK[" + chain_number + "] has not created! Error in AjaxChain__getAjax2!");
  }
 
}

function basket_count_handler(string) {
		basket_count.innerHTML = string;
}

var added_goods_id=0;
var added_price_id=0;

function hide(obj)
{
	var cur_style = 	obj.style.visibility;
	if(cur_style != "hidden")		{
		obj.style.visibility = "hidden";
	}
}

function add_goods_result(string)
{
	var obj = document.getElementById('added_msg_' + added_goods_id+'_'+added_price_id);
	obj.style.visibility = "visible";
	obj.innerHTML = string;
  setTimeout(function() {hide(obj)}, 1000);	
	added_goods_id = 0;
	added_price_id = 0;
	var AJAX_CHAIN1 =  new AjaxChain;
	AJAX_CHAIN1.getAjax('/cgi-bin/dsp.pl?cl=order&event=get_count_goods',basket_count_handler);
}

function add_to_basket(price_id, goods_id, is_radio)
{
	added_goods_id = goods_id;
	added_price_id = price_id;
	
	if(is_radio == 1)	{
		price_id = getRadioGroupValue(document.forms['AddToBasket'+goods_id+'_'+price_id].price_id);
	}
	
	var AJAX_CHAIN =  new AjaxChain; 
	var rnd = Math.random();
	
	AJAX_CHAIN.getAjax('/cgi-bin/dsp.pl?cl=order&event=add_to_basket_short&price_id='+price_id+'&goods_id='+goods_id+'&rnd='+rnd, add_goods_result);
}