function createRequestObject() {
var ro;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
ro = new ActiveXObject("Microsoft.XMLHTTP");
}else{
ro = new XMLHttpRequest();
}
return ro;
}

var http = createRequestObject();

function f_sndReq(action) {
http.open('POST', 'skrypt.php?szukaj='+action);
http.onreadystatechange = handleResponse;
http.send(null);
}

function f_hide(id){
document.getElementById(id).innerHTML = ""; // static
}

function handleResponse() {
if(http.readyState == 4){
var response = http.responseText;
// window.status="Proszę czekać...";
f_operacja(response);
// alert(response);
// document.getElementById('szukaj').value = response;
// document.getElementById('wd').innerHTML=response;
}
}