var tab1=null;
var tab2=null;
var tab3=null;

var htab1=null;
var htab2=null;
var htab3=null;

var tabview=null;

function tab1clicked() {
  htab2.className="tabheader tabheaderinactive";
  htab3.className="tabheader tabheaderinactive";
  htab1.className="tabheader tabheaderactive";
  tabview.innerHTML=tab1.innerHTML;
}

function tab2clicked() {
  htab1.className="tabheader tabheaderinactive";
  htab3.className="tabheader tabheaderinactive";
  htab2.className="tabheader tabheaderactive";
  tabview.innerHTML=tab2.innerHTML;
}

function tab3clicked() {
  htab1.className="tabheader tabheaderinactive";
  htab2.className="tabheader tabheaderinactive";
  htab3.className="tabheader tabheaderactive";
  tabview.innerHTML=tab3.innerHTML;
}

function initialize() {
  htab1=document.getElementById("htab1");
  htab2=document.getElementById("htab2");
  htab3=document.getElementById("htab3");

  tab1=document.getElementById("tab1");
  tab2=document.getElementById("tab2");
  tab3=document.getElementById("tab3");

  tabview=document.getElementById("tabview");

  tab1clicked();
}