//---thanks to alistapart

//-----------------------------------------------------------------------------rerender
//
// There is a bug/feature of FF: font sizes resize, but not dimensions of containers.
// The affected containers are forced to rerender thru minute changes of their dimensiosn
//

function rerender (x) {
w = 100 - 0.0001* (x);
document.getElementById ('header').style.width = w + '%';

wb = 16.8 - 0.0001* (x);
document.getElementById ('breadcrumbs').style.marginLeft = wb + '%';
}

//-----------------------------------------------------------------------------cookie functions

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;
}

//-----------------------------------------------------------------------------setActiveStyleSheet

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;
     }
   }
}

//-----------------------------------------------------------------------------getActiveStyleSheet

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;
}

//-----------------------------------------------------------------------------getPreferredStyleSheet

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;
}

//-----------------------------------------------------------------------------changeFontSize

function changeFontSize (fontSize) {
  switch (fontSize)
     {
      case 1 : setActiveStyleSheet('small font'); break;
      case 2 : setActiveStyleSheet('medium font'); break;
      case 3 : setActiveStyleSheet('large font'); break;
     }
  rerender (fontSize);
}

//-----------------------------------------------------------------------------displayFontSizeButtons
// buttons are displayed only when javascript is enabled.

function displayFontSizeButtons() {

li=document.getElementById('fontChanger');
li.innerHTML = '' +
'<a href="#" onclick="changeFontSize(1)">' +
'1</a> | ' +
'<a href="#" onclick="changeFontSize(2)">' +
'2</a> | ' +
'<a href="#" onclick="changeFontSize(3)">' +
'3</a>';

}


//-----------------------------------------------------------------------------onLoad

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

  rerender (4);
}

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