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 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();
  if (title == 'small') {
    MM_swapImage('btn_small','','/commonfiles/img/btn_fontsize_s2.gif','btn_medium','','/commonfiles/img/btn_fontsize_m.gif','btn_large','','/commonfiles/img/btn_fontsize_l.gif',1);
  } else if (title == 'large') {
    MM_swapImage('btn_small','','/commonfiles/img/btn_fontsize_s.gif','btn_medium','','/commonfiles/img/btn_fontsize_m.gif','btn_large','','/commonfiles/img/btn_fontsize_l2.gif',1);
  } else {
  	MM_swapImage('btn_small','','/commonfiles/img/btn_fontsize_s.gif','btn_medium','','/commonfiles/img/btn_fontsize_m2.gif','btn_large','','/commonfiles/img/btn_fontsize_l.gif',1);
  }
  setActiveStyleSheet(title);
  MM_preloadImages('img/e01_on.gif','img/e02_on.gif','img/e03_on.gif','img/e04_on.gif','img/e05_on.gif','img/e06_on.gif','img/e07_on.gif','img/e08_on.gif','img/e09_on.gif','img/e10_on.gif','img/e11_on.gif','img/e12_on.gif','img/e13_on.gif','img/e14_on.gif','img/e15_on.gif','img/e16_on.gif','img/e17_on.gif','img/e18ex_on.gif');
}

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

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