// zapíše vzkaz do chatu
function write_chat(){
    message = document.getElementById("message").value;
    document.getElementById("message").value = "";
    document.getElementById("message").focus();

    url = "http://" + location.hostname + "/chat_system_do.php?message=" + message;

    if(window.ActiveXObject){
        httppozadavek = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        httppozadavek = new XMLHttpRequest();
    }
    httppozadavek.open('GET', url, true);
    httppozadavek.onreadystatechange = function () {vypis_chat(); };
    httppozadavek.send(null);
}

// přečte vzkaz z chatu
function read_chat(){   
    url = "http://" + location.hostname + "/chat_system_do.php?session=";

    if(window.ActiveXObject){
        httppozadavek = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        httppozadavek = new XMLHttpRequest();
    }
    httppozadavek.open('GET', url, true);
    httppozadavek.onreadystatechange = function () {vypis_chat(); };
    httppozadavek.send(null);
    setTimeout('read_chat()',1000);
}

// přečte vzkaz z právě zapsaného chatu
function vypis_chat(){ 
  if(httppozadavek.readyState==4 && httppozadavek.status==200){
     document.getElementById("obsah").innerHTML=httppozadavek.responseText;
  }
}









// zjistí stav operátora
function info_chat(){   
    url = "http://" + location.hostname + "/chat_system_quick_info.php";

    if(window.ActiveXObject){
        httppozadavek_b = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        httppozadavek_b = new XMLHttpRequest();
    }
    httppozadavek_b.open('GET', url, true);
    httppozadavek_b.onreadystatechange = function () {vypis_chat_info(); };
    httppozadavek_b.send(null);
    setTimeout('info_chat()',3000);
}

function vypis_chat_info(){ 
  if(httppozadavek_b.readyState==4 && httppozadavek_b.status==200){
     document.getElementById("chat_info").innerHTML=httppozadavek_b.responseText;
  }
}