var his_tab=new Array();
var his_pos=-1;
var his_cnt=-1;
var his_max=10;

function history_reset() {
document.getElementById("top3_btn_next").className="nohistory";
document.getElementById("top3_btn_prev").className="nohistory";
his_tab=new Array();
var his_pos=-1;
var his_cnt=-1;
var his_max=10;
}

function history_back() {
if(his_pos==0 && his_cnt<his_max) {initialize2(); --his_pos; document.getElementById("top3_btn_prev").className="nohistory";}
else {
  if(his_pos>0) {
--his_pos;
document.getElementById("top3_btn_prev").onclick=his_tab[his_pos];
document.getElementById("top3_btn_prev").onclick();
document.getElementById("top3_btn_prev").onclick=history_back;

}

if(his_pos<0)
	document.getElementById("top3_btn_prev").className="nohistory";
if(his_pos<his_cnt)
	document.getElementById("top3_btn_next").className="";
	}
	
document.getElementById("top3_btn_next").className="";
}

function history_next() {
if(his_cnt-1>his_pos) {
  ++his_pos;
  document.getElementById("top3_btn_prev").onclick=his_tab[his_pos];
  document.getElementById("top3_btn_prev").onclick();
  document.getElementById("top3_btn_prev").onclick=history_back;
  
if(his_cnt-1==his_pos)
	document.getElementById("top3_btn_next").className="nohistory";

document.getElementById("top3_btn_prev").className="";
}

}

function history_delfirst() {
for(i=0;i<his_max;++i) {
	hist_tab[i]=hist_tab[i+1];
	}
}

function history_add(obj) {
if(obj!="top3_btn_next" && obj!="top3_btn_prev") {//jezeli wywolanie wystapilo od innego przycisku niz next prev
	++his_pos;
	if(his_pos>his_max) {
		his_pos=his_max;
		history_delfirst();
		}
	if(obj=="id_fnd_city")
		his_tab[his_pos]=document.getElementById(obj).onblur;
	else if(obj=="sel_wid" || obj=="sel_pid_dfd")
		his_tab[his_pos]=document.getElementById(obj).onchange;
	else
		his_tab[his_pos]=document.getElementById(obj).onclick;
	his_cnt=his_pos+1;
	document.getElementById("top3_btn_next").className="nohistory";

	if(his_pos>=0) document.getElementById("top3_btn_prev").className="";
	}
}