function ajax( kam)
{

    var httpRequest;

    if(typeof window.ActiveXObject != 'undefined')
    {
        httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else
    {
        httpRequest = new XMLHttpRequest();
    }
    httpRequest.open("GET", 'http://www.literatky.cz/news/news-email/'+ document.getElementById('news-email').value, 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 = 'Čekejte...';
        }
    }

}
function showInfo(id) {
  var el = document.getElementById('info'+id);
  if(el.style.display == 'block') {
    el.style.display = 'none';
  } else {
    el.style.display = 'block';
  }
}