imgon = new Image();
imgoff = new Image();
imgon.src = "images/m_indic_green_on.gif";
imgoff.src = "images/m_indic_green_off.gif";

function setImage () {
  if (getActiveStyleSheet() == "S:AAB Green") imgon.src = "images/m_indic_green_on.gif";
  if (getActiveStyleSheet() == "S:AAB Green") imgoff.src = "images/m_indic_green_off.gif";

  if (getActiveStyleSheet() == "S:AAB BlackWhite") imgon.src = "images/m_indic_bw_on.gif";
  if (getActiveStyleSheet() == "S:AAB BlackWhite") imgoff.src = "images/m_indic_bw_off.gif";
  
  if (getActiveStyleSheet() == "S:AAB Red") imgon.src = "images/m_indic_red_on.gif";
  if (getActiveStyleSheet() == "S:AAB Red") imgoff.src = "images/m_indic_red_off.gif";
  
  if (getActiveStyleSheet() == "S:AAB Blue") imgon.src = "images/m_indic_blue_on.gif";
  if (getActiveStyleSheet() == "S:AAB Blue") imgoff.src = "images/m_indic_blue_off.gif";
}

function on(imgid)
{
  setImage();
  document.getElementById(imgid).src = imgon.src;
}

function off(imgid)
{
  setImage();
  document.getElementById(imgid).src = imgoff.src;
}

function setActiveStyleSheetOnLoad(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function setActiveStyleSheet(title) {
  setActiveStyleSheetOnLoad(title);
  off('i_home');
  off('i_news');
  off('i_techsec');
  off('i_proc');
  off('i_perseqt');
  off('i_ident');
  off('i_vi');
  off('i_relais');
  off('i_guestbook');
  off('i_contact');
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheetOnLoad(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);