function makefocused(elem) {
  if (elem.className.length > 0)
    elem.className += " focused";
  else
    elem.className += "focused";
}

function makeunfocused(elem) {
  if (elem.className == "focused")
    elem.className = "";
  else if (elem.className.indexOf(" focused") > 0)
    elem.className = elem.className.substr(0, elem.className.length - 8);
}

function add(elem) {
  elem.onfocus = function() {
    makefocused(this);
  }
  elem.onblur = function() {
    makeunfocused(this);
  }
}

function find(elem) {
  if (elem.nodeType == 1 && ((elem.tagName == "INPUT" && (elem.type == "text" || elem.type == "file" || elem.type == "password")) || elem.tagName == "TEXTAREA"))
    add(elem);
  if (elem.childNodes.length > 0) {
    for (var i = 0; i < elem.childNodes.length; i++)
      find(elem.childNodes[i]);
  }
}

function start() {
  for (var count = 0; count < document.forms.length; count++)
    find(document.forms[count]);
  tab_sel = document.getElementById('atab'+visible_tab);
  tab_sel.className = "tab_sel";
}

function show_tab(n) {
  div_to_view = document.getElementById('tab'+visible_tab);
  div_to_view.style.display = "none";  
  tab_sel = document.getElementById('atab'+n);
  tab_sel.className = "tab_sel";

  div_to_hidden = document.getElementById('tab'+n);
  div_to_hidden.style.display = "block";  
  tab_no_sel = document.getElementById('atab'+visible_tab);
  tab_no_sel.className = "tab_no_sel";
  visible_tab = n;
}

visible_tab=1;

window.onload = start;