// AJAX functions
// 2oo9 (c) Peter HECHT
// ***********************************
// hate Macrosoft :))))

function ajax(stranka, kam)
{

    var httpRequest;
    
    if(typeof window.ActiveXObject != 'undefined')
    {
        httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else
    {  
        httpRequest = new XMLHttpRequest();
    }
    httpRequest.open("GET", stranka, true);
    httpRequest.onreadystatechange= function () 
    {
        processRequest(httpRequest, kam) 
    };
    httpRequest.send(null);
}


function processRequest(httpRequest, kam) 
{
    if (httpRequest.readyState == 4)
    {
        if(httpRequest.status == 200)
        {
            if (typeof kam == 'string') 
            {
                document.getElementById(kam).innerHTML = httpRequest.responseText;
            }
            if (typeof kam == 'function') 
            {
                kam(httpRequest.responseText);
            }
        }
        else
        {
            alert("Chyba pri nacitani stanky " + httpRequest.status +" : "+ httpRequest.statusText);
        }
    }
    else
    {
        if (typeof kam == 'string' && kam != '') 
        {
            document.getElementById(kam).innerHTML = '<center><Br><br><br><img src="loader.gif"></center>';

          
        }
    }
       
} 

function zmen(a)
 {
 
 document.getElementById('z2').style.background='url(images/topt2.png)';
 document.getElementById('z3').style.background='url(images/topt2.png)';
 document.getElementById('z4').style.background='url(images/topt2.png)';
 document.getElementById('z5').style.background='url(images/topt2.png)';
 
 if (a==1) 
 {
 document.getElementById('z1').style.background='url(images/topt.png)';
 } else 
 {
  document.getElementById('z1').style.background='url(images/topt4.png)';
   document.getElementById('z'+a).style.background='url(images/topt3.png)';

 }
 
 }