// cookie setter and getter functions

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;
}

// Used for activating and deactivating style sheets for print
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;
    }
  }  
}

//Used when user pushing a button to change the text size
function manualSetActiveStyleSheet(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;
    }
  }  
  hideTextButtons();
  showTextButton(title);
}



function hideTextButtons(){
		var text_size_1 = document.getElementById('text_size_1');
		var text_size_2 = document.getElementById('text_size_2');
		var text_size_3 = document.getElementById('text_size_3');
		var text_size_4 = document.getElementById('text_size_4');
		var text_size_5 = document.getElementById('text_size_5');
		
		text_size_1.style.display = 'none';
		text_size_2.style.display = 'none';
		text_size_3.style.display = 'none';
		text_size_4.style.display = 'none';
		text_size_5.style.display = 'none';
}

function showTextButton(show_style){
	var text_size_1 = document.getElementById('text_size_1');
	var text_size_2 = document.getElementById('text_size_2');
	var text_size_3 = document.getElementById('text_size_3');
	var text_size_4 = document.getElementById('text_size_4');
	var text_size_5 = document.getElementById('text_size_5');
	
	if(show_style == 'styles_xsm'){
	  	text_size_1.style.display = "block";
	  }
	 
	  if(show_style == 'styles_sm'){
	  	text_size_2.style.display = "block";
	  }
	  
	   if(show_style == 'styles_md'){
	  	text_size_3.style.display = "block";
	  }
	  
	   if(show_style == 'styles_lg'){
	  	text_size_4.style.display = "block";
	  }
	  
	   if(show_style== 'styles_xlg'){
	  	text_size_5.style.display = "block";
	  }
}


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;
}


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);