function ndeSetTextSize(chgsize,rs) {
  var startSize;
  var newSize;
  if (!document.getElementsByTagName){return;}
  startSize = parseInt(ndeGetDocTextSize());
  if (!startSize){ startSize = 11; }
  switch (chgsize)  {
	  case 'incr':
		 newSize = startSize + 1;
		 break;
	  case 'decr':
		 newSize = startSize - 1;
		 break;
	  case 'reset':
		 if (rs) {newSize = rs;} else {newSize = 11;}
		 break;
	  default:
		 newSize = parseInt(ndeReadCookie("pl-textsize", true));
		 if (!newSize){newSize = startSize;}
		 break;
  }
  if (newSize < 5){ newSize =5;}
  newSize += 'px';
  //document.getElementsByTagName('html')[0].style.fontSize = newSize;
  document.getElementsByTagName('body')[0].style.fontSize = newSize;
  ndeCreateCookie("pl-textsize", newSize, 365, true);
}

function ndeGetDocTextSize() {
  if (!document.getElementsByTagName)  { return 0; }
  var size = 0;
  var body = document.getElementsByTagName('body')[0];
  if (body.style && body.style.fontSize) {  size = body.style.fontSize; }
  else if (typeof(getComputedStyle) != 'undefined') {  size = getComputedStyle(body,'').getPropertyValue('font-size');  }
  else if (body.currentStyle) {  size = body.currentStyle.fontSize; }
  return size;
}

function ndeSetStyleSheet(newtitle){
  // this function exists solely to 
  // distinguish when the user chooses a new
  // theme. IE does not properly reflow the page
  // when a new theme is chosen and we must force
  // a reload when IE users choose a new theme.
  ndeSetStyleSheetInternal(newtitle);
  if (navigator.userAgent.indexOf('MSIE') != -1 && !window.opera &&  navigator.product != 'Gecko'){ history.go(0);}
}

function ndeSetStyleSheetInternal(newtitle) {
  if (!document.getElementsByTagName) { return;}
  var i;
  var savedtitle = '';
  var links = document.getElementsByTagName("link");
  if (!newtitle) { newtitle = savedtitle = ndeReadCookie("nde-style", false); }
  if (!newtitle) {newtitle = ndeGetPreferredStyleSheet();}
  var activesheet = null;
  for (i = 0; i < links.length; i++)  {
    var a = links[i];
    var rel = a.getAttribute('rel');
    var title = a.getAttribute('title');
    if (rel.indexOf("style") != -1 && title)  {
      a.disabled = true;
      if (title == newtitle){
        activesheet = a;
      }
    }
  }
  if (activesheet) { activesheet.disabled = false;}
  if (newtitle != savedtitle){ ndeCreateCookie("nde-style", newtitle, 365, false);}
}

function ndeGetActiveStyleSheet() {
  if (!document.getElementsByTagName)  {return null; }
  var i;
  var links = document.getElementsByTagName("link");
  for(i = 0; i < links.length; i++)  {
    var a = links[i];
    var rel = a.getAttribute('rel');
    var title = a.getAttribute('title');
    if (rel.indexOf("style") != -1 && title && !a.disabled) { return title;}
  }
  return null;
}

function ndeGetPreferredStyleSheet() {
  if (!document.getElementsByTagName){return null;}
  var i, a;
  var links = document.getElementsByTagName("link");
  for (i = 0; i <  links.length; i++)   {
    a = links[i];
    var rel = a.getAttribute('rel');
    var title = a.getAttribute('title');
    if (rel.indexOf("style") != -1 && rel.indexOf("alt") == -1 && title){return title;}
  }
  return null;
}

function ndeCreateCookie(name,value,days,useLang) {
  var langString = useLang ? ndeGetLang() : "";
  var cookie = name + langString + "=" + value + ";";
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    cookie += " expires=" + date.toGMTString() + ";";
  }
  cookie += " path=/";
  document.cookie = cookie;
}

function ndeReadCookie(name, useLang) {
  var langString = useLang ? ndeGetLang() : "";
  var nameEQ = name + langString + "=";
  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 ndeSetTheme(){
  checkForUpgrade();
  ndeSetStyleSheetInternal();
  ndeSetTextSize();
  return true;
}

function ndeGetLang(){
  var langString = "";
  if (document.documentElement){
    langString = document.documentElement.lang;
    if (langString != ""){langString = "-" + langString;    }
  }  
  return langString;
}

function checkForUpgrade(){
  var rvValue = -1;
  if (navigator.product == 'Gecko') {
    rvValue = 0;
    var ua      = navigator.userAgent.toLowerCase();
    var rvStart = ua.indexOf('rv:');
    var rvEnd   = ua.indexOf(')', rvStart);
    var rv      = ua.substring(rvStart+3, rvEnd);
    var rvParts = rv.split('.');
    var exp     = 1;
    for (var i = 0; i < rvParts.length; i++) {
      var val = parseInt(rvParts[i]);
      rvValue += val / exp;
      exp *= 100;
    }
  }
  if (!document.getElementById || ( rvValue >= 0 && rvValue < 1.0)) {
    var updateMessageShown = ndeReadCookie('upgrade');
    if (!updateMessageShown) {
      ndeCreateCookie('upgrade','1', 90);
      // check if cookie written. If not, don't redirect
      if (ndeReadCookie('upgrade'))  {document.location = '/upgrade.html';}
    }
  }
}

function printAlert() {
	alert('Thanks to the use of a print-media stylesheet, this page is already printer-friendly!  Just print the article from a CSS-capable browser to get the print styles on paper.');
}

function init() {
  //cssjsmenu('navbar');
  cssjsmenu('config');
  if (document.getElementById)  {
    var kill = document.getElementById('hoverJS'); 
    kill.disabled = true;
  }
  ndeSetStyleSheetInternal();
}