function ajax(stranka, kam)
{

    var httpRequest;
    
if (window.XMLHttpRequest) {
httpRequest = new XMLHttpRequest();
} else if (window.ActiveXObject) {
try {
httpRequest = new ActiveXObject('Microsoft.XMLHTTP');
} catch(e) {
httpRequest = new ActiveXObject('Msxml2.XMLHTTP');
}
} else {
document.getElementById(kam).innerHTML = '<strong>Bohužel, váš JavaScript nepodporuje AJAX.</strong>';
}

    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;
            }
        }
        else
        {
            alert("Chyba pri nacitani stanky " + httpRequest.status +" : "+ httpRequest.statusText);
        }
    }
    else
    {
        if (typeof kam == 'string' && kam != '') 
        {
            document.getElementById(kam).innerHTML = '<div class=\"center\"><img src=\"http://blog.antonindanek.cz/grafika/ajax-loade-koment.gif\" alt=\"ajax.gif\" /></div>';
        }
    }
       
}