// style switching functions

var setActiveStyleSheet = function(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;
     }
   }
}

var changeFontSize = function(newFontSize)
{
    $('html').css('font-size', newFontSize);
    switch(newFontSize)
    {
        case '1em':
        case '16px':
            $('#body-container').css('top', '0');
        break;
        case '1.2em':
        case '20.8px':
            $('#body-container').css('top', '0');
        break;
        case '1.3em':
        case '27.2px':
            $('#body-container').css('top', '0x');
        break;
    }
}

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;
}

var getFontSize = function()
{
    var curFontSize = $('html').css('font-size');
    return curFontSize;
}

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();
  setActiveStyleSheet(title);
}

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

var eraseCookies = function()
{
    createCookie('style',"",-1);
    createCookie('font_size',"",-1);
}

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

var cookie2 = readCookie("font_size");
var font_size = cookie2 ? cookie2 : '1em';
changeFontSize(font_size);
});