var FONTS = new Array("A1", "A2", "A3");
var DEFAULT_STYLE = 0;


function getPos(element) {
    for(i=0;i<FONTS.length;i++){
     if(FONTS[i] == element)
      return(i);
    }
    return(false);
}

function incFS() {
  var active = getActiveStyleSheet();
  var pos = getPos(active);
  pos++;
  if(pos<FONTS.length)
   setActiveStyleSheet(FONTS[pos]);
}
  
function decFS() {
  var active = getActiveStyleSheet();
  var pos = getPos(active);
  pos--;
  if(pos > -1 ) {
    setActiveStyleSheet(FONTS[pos]);
  }
}

 
/*   

function enableBtn(id, tooltip) {
    var button = document.getElementById(id);
    button.src = button.src.replace('_off.gif', '.gif');
}

function disableBtn(id) {
    var button = document.getElementById(id);
    button.src = button.src.replace('.gif', '_off.gif');
}*/
 
function setActiveStyleSheet(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;
    }
  } 
  
  /* hier button disable enable einbauen */
 
}

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() {
  return (FONTS[DEFAULT_STYLE]);
}

function setCookie(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 getCookie(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 = getCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

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

var cookie = getCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
if (title == 'null') {
  title = getPreferredStyleSheet();
}

setActiveStyleSheet(title);