// JavaScript Document


/*
	Written by Jonathan Snook, http://www.snook.ca/jonathan
	Add-ons by Robert Nyman, http://www.robertnyman.com
	Modified 2008, Specto Design, Inc.
*/



function toggleFontSize() {
  active = getActiveStyleSheet();
  
  //alert('toggleFontSize: current stylesheet: ' + active);
  switch (active) {
    case 'standard' : 
      setActiveStyleSheet('large');
	  //alert('toggleFontSize-new stylesheet: ' + getActiveStyleSheet());
      break;
   case 'large' : 
      setActiveStyleSheet('standard');
	  //alert('toggleFontSize-new stylesheet: ' + getActiveStyleSheet());
      break;
    default :
      setActiveStyleSheet('large');
      break;
  }
  
}

//function fontsizedown() {
//  active = getActiveStyleSheet();
//  switch (active) {
//    case 'A++' : 
//      setActiveStyleSheet('A+');
//      break;
//    case 'A+' : 
//      setActiveStyleSheet('A');
//      break;
//    case 'A' : 
//      setActiveStyleSheet('A-');
//      break;
//    case 'A-' : 
//      setActiveStyleSheet('A--');
//      break;
//    case 'A--' : 
//       break;
//    default :
//      setActiveStyleSheet('A--');
//      break;
//  }
//}

function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	  
	  //alert('setActiveStyleSheet - stylesheet title: ' + a.getAttribute("title"));
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
	  //alert('setActiveStyleSheet-disabled: ' + a.getAttribute("title"));
      if(a.getAttribute("title") == title) { 
	  	a.disabled = false;
		//alert('setActiveStyleSheet-enabled: ' + a.getAttribute("title"));
	  }
    }
  }
}

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 ('standard');
}

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();
//alert('fire setActiveStyleSheet on window.onload');
  setActiveStyleSheet(title);
}

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

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

//alert('fire setActiveStyleSheet on library bottom');
setActiveStyleSheet(title);