var url = "usercheck.php?param="; // The server-side script


function updateUser() {
  // display a quick message while the script is being processed
  document.getElementById('uname').innerHTML = "<font color='black'>... Név ellenőrzés ...</black>";
  var name = document.getElementById("nickname").value;
  http.open("GET", url + escape(name), true);
  http.onreadystatechange = handleHttpResponse;
  http.send(null);
}

function handleHttpResponse() {
  if (http.readyState == 4) {
    results = http.responseText;
    var name = document.getElementById("nickname").value;
    // the div in which the message appears
    document.getElementById('uname').innerHTML = results;
  }
}


function getHTTPObject() {
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}
var http = getHTTPObject(); // We create the HTTP Object