var xhr;

function getpr() {

  var username = document.getElementById("userId").value;
  var url = "/getpreftable.jsp?userId=" + username;



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

  xhr.open("get", url, true);
  xhr.onreadystatechange = tbldisplay;
  xhr.send(null);

}

function tbldisplay() {

  if (xhr.readyState == 4) {
    if (xhr.status == 200) {
      document.getElementById("lbox").innerHTML = xhr.responseText;
    }  

  }

}

function lgt() {

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

  xhr.open("get", "lgt.jsp", true);
  xhr.onreadystatechange = tbldisplay;
  xhr.send(null);

}