function updatetabcontent() {
if (request.readyState == 4) {
    if (request.status == 200) {
      /* Get the response from the server */
      var response = request.responseText;
      document.getElementById("ajaxtabcontent").innerHTML=response;
    } else {
      alert("Error! Request status is " + request.status);
    }
  }
}

function changetab(page,tab,number) {
  for(i=1; i <= number; i++) {
     document.getElementById("tab"+i).className="kk-tabs-not-selected";    
  } 
  document.getElementById("tab"+tab).className="kk-tabs-selected";
  document.getElementById("ajaxtabcontent").innerHTML="<div id=\"mainContent\"><img src=\"images/loadinfo.gif\" width=\"24\" height=\"24\" vspace=\"25\"></div><div class=\"clear\"> </div>";
  var url = "get_tabcontent.php";
   request.open("POST", url, true);
   request.onreadystatechange = updatetabcontent;
   request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   request.send("page=" + escape(page) + "&tab=" + escape(tab));      
}