// toggle visibility
function toggle( targetClass ){
  if (document.getElementByClass){
  		target = document.getElementByClass( targetClass );
  			if (target.style.display == "none"){
  				target.style.display = "";
  			} else {
  				target.style.display = "none";
  			}
  	}
}


// nn4 resize fix
function resizeFix(){
   if(document.resizeFix.initWidth!=window.innerWidth
          ||document.resizeFix.initHeight!=window.innerHeight)
document.location=document.location;
}
function checkBrowser(){
   if(document.layers){
          if(typeof document.resizeFix=="undefined"){
document.resizeFix=new Object();
document.resizeFix.initWidth=window.innerWidth;
document.resizeFix.initHeight=window.innerHeight;
          }
          window.onresize=resizeFix;
   }
}
checkBrowser();

// Popup window, 640 x 480


function open_window(url) {
mywin = window.open(url,"win",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=640,height=480');
}


// Popup window, 800 x 600


function open_bigwindow(url) {
bigwin = window.open(url,"bigwin",'toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width=800,height=600');
}

// Popup window, 400 x 200

function flubber(url) {
mywin =
window.open(url,"win",'toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=0,resizable=0,width=400,height=200');
}


// let reader choose style sheet

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();
  setActiveStyleSheet(title);
}

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

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

// toggle visibility 

function toggle( targetId ){
  if (document.getElementById){
  		target = document.getElementById( targetId );
  			if (target.style.display == "none"){
  				target.style.display = "";
  			} else {
  				target.style.display = "none";
  			}
  	}
}