function createXMLHttpRequest() {

var ua;

if(window.XMLHttpRequest) {
    try {
      ua = new XMLHttpRequest();
    } catch(e) {
      ua = false;
    }
  } else if(window.ActiveXObject) {
    try {
      ua = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
      ua = false;
    }
  }
  return ua;
}

var req = createXMLHttpRequest();

function sendRequest(id,idz) {
  req.open('get', 'index.php?p=_gettab&id=' + id + '&idz=' + idz);
  req.onreadystatechange = handleResponse;
  req.send(null);
}

function sendRequest2(id,idz) {
  req.open('get', 'index.php?p=_gettab2&id=' + id + '&idz=' + idz);
  req.onreadystatechange = handleResponse;
  req.send(null);
}

function handleResponse() {

  if(req.readyState == 4){
    var response = req.responseText;
    var update = new Array();

    if(response.indexOf('||' != -1)) {
      update = response.split('||');
      document.getElementById('tab_content').innerHTML = update[1];
    }
  }
  //else
  //alert("loading" + req.readyState);
}