function ajax(stranka, kam, element)
{
    var httpRequest;
	var url = stranka+document.getElementById(element).value;
    if(typeof window.ActiveXObject != 'undefined')
    {
        httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else
    {  
        httpRequest = new XMLHttpRequest();
    }
    httpRequest.open("GET", url, 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') 
            {
                if (httpRequest.responseText == '') document.getElementById('podkategorie_select_nadpis').innerHTML = ''
                    else document.getElementById('podkategorie_select_nadpis').innerHTML = "Podkategorie <sup>*)</sup>";
                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 = 'Čekejte...';
        }
    }
       
}