var XMLHttpRequestObject = false;

if(window.XMLHttpRequest){
  XMLHttpRequestObject = new XMLHttpRequest();
}
else if(window.ActiveXObject){
  XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
}

function pobierz(dest,id_kat,ile, offset)
{
  if(XMLHttpRequestObject){
    var div = document.getElementById(dest);
    var url = "funkcje_ksiega.php?dest=" + dest+"&id_kategorii="+id_kat+"&ile="+ile+"&offset="+offset;
    XMLHttpRequestObject.open("GET", url,true);
    XMLHttpRequestObject.onreadystatechange = function()
    {
      if(XMLHttpRequestObject.readyState == 4 && 
          XMLHttpRequestObject.status == 200){
        var str = XMLHttpRequestObject.responseText;
        div.innerHTML = str;
      }
    }
    XMLHttpRequestObject.send(null);
  }
}