var msg_divs = 0; // aktualna ilosc divow z wiadomosciami o aktualnie wykonywanych akcjac
var msg_q = []; // kolejka wiadomosci na temat aktualnie wykonywanych akcji..
var q = [];//queue
var aq;//active queue
areq.callback_values_array = [];
areq.processing = false;
// method: post/get
// url: request_url
// response_function: any not default response function (might be an empty string if using the default function)
// id - id where to put data that we get from ajax
// params: params to add to request
// button_id - id of button to block during request
// action_msg - action to show during request
// action_id - id of element where to show action status

function areq(method,url,response_function,id,params,button_id,action_msg,action_id,finish_function)
{
	//alert(params);return false;
	if(!response_function)response_function = default_ajax_response_function;
	if(button_id) 
	{
		if(button_id.substring(0,1) == '-')
		{
			block_buttons(button_id.substring(1),true,'input');
			block_buttons(button_id.substring(1),true,'select');
		}
		else document.getElementById(button_id).disabled=true;
	}
	if(!areq.http || areq.processing==false) // tworzymy nowy obiekt gdy go nie ma lub gdy ostatni zakonczyl dzialalnosc..
	{
		try{areq.http=new XMLHttpRequest();}catch (e){try{areq.http=new ActiveXObject("Msxml2.XMLHTTP");}catch (e){areq.http=new ActiveXObject("Microsoft.XMLHTTP");}}
	}
	if (areq.http==null) {alert ("Your browser does not support AJAX!");return;}
	
	//alert('pushing...');
	if(action_msg) add_msg_to_div(action_msg);
	q.push([method,url,response_function,id,params,button_id,action_msg,action_id,finish_function]);	
	if(areq.processing === false)
	{
		//alert('requesting function...');
		areq.processing = true;
		default_ajax_response_function();
	}
}

function add_msg_to_div(msg)
{
	msg_q.push(msg);
	//alert(msg_q);
	msg_divs++;
	set_msg_divs();
}
function del_msg_from_div()
{
	msg_q.shift();
	//alert(msg_q);
	set_msg_divs();
}

function set_msg_divs()
{
	var top_pos = 0;
	for(i=0;i<msg_divs;i++)
	{
		id_name = 'waitImage'+i;
		div_hand = document.getElementById(id_name);
		if(i<msg_q.length)// wiadomosci pokazujemy tylko w tych divach, dla ktorych istnieja wyrazy w tablicy z wiadomosciami
		{
			msg = '<table cellspacing=0 cellpadding=0 border=0><tr><td style="padding-right: 2px; padding-top: 0px; padding-left: 1px; padding-bottom: 0px;"><img src="/images/ajax-loader.gif"></td><td style="font-weight: bold; font-size: 11px; color: #FFFFFF; padding-top: 2px;"> '+msg_q[i]+'</td></tr></table>';
			visibility='';
		}
		else // jesli indeks `i` wyszedl juz poza wielkosc tablicy z wiadomosciami to aktualny DIV ma byc ukryty
		{
			msg = '';
			visibility='hidden';
		}
		if(div_hand)
		{
			//alert('div '+id_name+" istnieje.. zmieniam:\n\n"+div_hand.innerHTML+"\n\nna:\n\n"+msg+"\n\nnowe visibility: "+visibility);
			div_hand.innerHTML = msg;
			document.getElementById(id_name).style.visibility=visibility;
		}
		else
		{
			//alert('div '+id_name+" NIE istnieje.. zmianiam:\n\n"+div_hand.innerHTML+"\n\nna:\n\n"+msg+"\n\nnowe visibility: "+visibility);
			document.getElementById('ajax_msg_divs').innerHTML = document.getElementById('ajax_msg_divs').innerHTML + '<h1 id="waitImage'+i+'" style="position:fixed; _position:absolute; top:'+top_pos+'; _top:expression(eval((ignoreMe = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop)+'+top_pos+')); right:0; background:#ba2727; color: #FFFFFF; padding: 0.2em; font-size: 11px; visibility: '+visibility+';"> '+msg+'</h1>';
																										//( ( 10 + (  ) ) + 'px' );
		}
		top_pos=top_pos+30;
	}
	//alert(msg_divs);
}

function default_ajax_response_function() 
{
	//alert(areq.http.readyState);
	if(areq.http.readyState==0) // The request is not initialized
	{			
		aq = q.shift();
		aq[2].id = aq[3];
		areq.http.open(aq[0],aq[1],true);
		areq.http.onreadystatechange=aq[2];
		if(aq[0]=='POST')
			areq.http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		areq.http.send(aq[4])
	}
	else if(areq.http.readyState==4) // The request is complete
	{
		if(aq[5])
		{
			if(aq[5].substring(0,1) == '-')
			{
				block_buttons(aq[5].substring(1),false,'input');
				block_buttons(aq[5].substring(1),false,'select');
			}
			else document.getElementById(aq[5]).disabled=false;
		}
		
		if(aq[2].id!='')
		{
			// jesli ID jest poprzedzone znakiem '-' to oznacza, iz chcemy "schowac" ow element:
			if(default_ajax_response_function.id.substr(0,1) == '-')
			{
				document.getElementById(default_ajax_response_function.id.substr(1)).style.display = "none";
			}
			// jesli ID jest poprzedzone znakiem '=' to oznacza, iz chcemy "pokazac" ow element:
			else if(default_ajax_response_function.id.substr(0,1) == '=')
			{
				return_val = areq.http.responseText;
				// gdy zwrocono pusta wartosc lub "-1" (wartosc oznaczajaca jakis blad) to nie 'pokazujemy' elementu...:
				if(return_val!='')
				{
					document.getElementById(default_ajax_response_function.id.substr(1)).style.display = "inline";
					document.getElementById(default_ajax_response_function.id.substr(1)).innerHTML=return_val;
				}
				areq.return_val = return_val;
			}
			else
			{
				return_val = areq.http.responseText;
				
				// znak plus oznacza, iz nic nie robimy...:
				if(default_ajax_response_function.id.substr(0,1) == '+')
				{
					areq.return_val = return_val;
				}
				else
				{					
					document.getElementById(default_ajax_response_function.id).innerHTML=return_val;
					areq.return_val = return_val;
				}
			}
		}
		else
		{
			return_val = areq.http.responseText;
			areq.return_val = return_val;
		}
		
		//alert(aq);
		if(aq[6]!='')
		{	
			if(aq[7]!='')
			{
				document.getElementById(aq[7]).style.visibility='';
				document.getElementById(aq[7]).innerHTML='Finished action: '+aq[6]+' ('+current_time()+')';
			}
			del_msg_from_div();
		}

		if(aq[8])
		{
			areq.finish_function=aq[8];
			areq.finish_function(default_ajax_response_function.id);
		}
		
		if(q.length > 0)
		{
			aq = q.shift();
			if(aq[5].substring(0,1) == '-')
			{
				block_buttons(aq[5].substring(1),true,'input');
				block_buttons(aq[5].substring(1),true,'select');
			}
			else if(aq[5]) document.getElementById(aq[5]).disabled=true;
			aq[2].id = aq[3];			
			areq.http.open(aq[0],aq[1],true);
			areq.http.onreadystatechange=aq[2];
			if(aq[0]=='POST')
				areq.http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
			areq.http.send(aq[4])
		}
		if(q.length == 0)
		{
			areq.processing = false;
		}
	}
}

function block_buttons(id,mode,tag)
{
	var inputs=document.getElementsByTagName(tag);
	for(i=0;i<inputs.length;i++)
	{
		if(inputs[i].id.substring(0,id.length) == id)
		{
			inputs[i].disabled=mode;
		}
	}
}

function get_ajax_return_val()
{
	if(areq.return_val.substring(0,4)=='err:')
	{
		alert('Ajax error: '+areq.return_val.substring(4));
		return false;
	}
	
	return areq.return_val;
}