// Correct_layout sorgt dafür, dass alle drei Portalspalten mit den Namen navigation, content und feature die gleichen Höhen erhalten.

function correct_layout() {
   if(document.getElementById('content').offsetHeight) {
     var div_heights = new Array(
       document.getElementById('content').offsetHeight,
       document.getElementById('navigation').offsetHeight,
       document.getElementById('features').offsetHeight);
     div_heights = div_heights.reverse(div_heights.sort(num_sort));
     var style_height = div_height[0] + "px";
     document.getElementById('navigation').style.height = style_height;
     document.getElementById('content').style.height = style_height;
     document.getElementById('features').style.height = style_height;
   }
}

function num_sort(a,b) {
  return a-b;
}


//hier ist die js-funktionen (dankbar von www.thestyleworks.de/tut-//art/style_switcher_1.shtml:


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;
     }
   }
}
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 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;
}
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;
}
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}
window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}